The Girondins who were purged for being too far-right for the Jacobins' tastes? The Girondins who promptly made common cause in the Federalist Revolts with literal royalists?

Yeah, those guys. Even if they were royalists themselves, the central principle of the French Revolution until that point was democracy and opposition to tyranny. Purging democratically elected representatives was a complete break with everything that had come before it during the Revolution; the fact that the party getting purged was right-leaning doesn't change that. Being opposed to something done by a left-leaning faction doesn't automatically make one a reactionary.

Interpreting the French Revolution, an incident sparked by the demands of a national congress for national standardization of representation in a centralized system, as anti-centralization is a very curious take;

"Authoritarian" is the keyword here. Authoritarianism was literally the one thing all revolutionaries could agree was bad.

dismissing the conservativism of the leaders of the opposition is even more curious.

That's because the stated goals of the revolts (restoring the freedom of the Convention) weren't reactionary, and people of various political views supported—or even fought for) those goals.

The overwhelming objection was not that Paris's power was centralized - a matter they were more than happy to support when it suited them - but that the regime in Paris was too radical for their tastes.

By "Paris" I don't mean "Paris from its position as the capital;" I literally just mean Paris the city. The purge was Paris sans culottes enforcing their will over the Convention—and by extension, over the whole country. It was like if DC residents were extralegally deciding who gets to sit in Congress. Would opposing that be reactionary if the people doing the deciding were Marxists? Up until that point the Revolution had put power in the hands of a group of people elected (not 100% democratically) by all of France; the shift from that to a Convention controlled by Paris radicals was very real and not more of the same.

The purge of the Girondins was a triggering event, but not the basis of the Federalist revolts, which occurred overwhelmingly by the support of the wealthy bourgeoisie which felt the Revolution had gone 'too far', in concert with royalist counterrevolutionaries.

It was the triggering event that defined the revolts' stated aims; they can't be seriously evaluated without taking it into account.

"Religious oppression" here meaning "Not allowing theocracy to continue".

No? The Civil Constitution of the Clergy and the treatment of refractory priests (overwhelmingly poor parish priests, not rich bishops) were grade A religious oppression. This was the thing that pushed the Vandee towards revolt, and it's no coincidence that revolt only really ended when this oppression was ended. You could replace Catholicism with any religion and this stuff would still be messed up.

The threat to declare war was openly and freely made first by the anciens regimes

He despised the weakness and the folly of the émigrés and excluded them from his councils. He earnestly desired to avoid a war which might endanger his sister or her husband.

- https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/French_Revolution,_The

This link also dispels the idea that the "anciens reigmes" (which, BTW, these guys were not united at all) wanted war with France in the next section. The Girondins wanted war (and yes, it was the Girondins that wanted war; Robespierre for example was not impressed with the idea) not to protect France, but to further the Revolution and their own power. It's ironic that war would prove to be the undoing of both. Also the arguments they made for war did include nebulous Austrian support for monarchism (which, again, was nonexistent; there was no "Austrian Committee"), but also that war would expand French power, export the Revolution, root out counterrevolutionaries, unite the country and cure cancer or something Idfk. This stuff was pure, unadulterated warmongering.

and armed bodies of emigres not only allowed, but supplied and supported as they built their forces on the borders of France.

See the link above.