That depends on whether you interpret "when" + past tense in English to also assert the reality of the temporal clause. The interpretation which allows the vacuous truth is, in my opinion, not even technically correct (by correct I mean aligns with actual spoken usage). It would amount to formalizing the sentence as

For all meetings between us, if said meeting is at a past time and it's the first meeting (i.e. before all other meetings), you promised at that time to give me all your money.

Which is indeed vacuously true, if there have been no past meetings, or even if the meetings aren't well-ordered in time :). On the surface this is a perfectly good interpretation, but it doesn't really align with real usage (though I would love to see an example of "when" + past tense being used this way, e.g. in a legal document).

On the other hand, most people would interpret "when" + past to assert that the event actually happened, which in this context means

I have met you before, a "first meeting" can be identified, and at that first meeting, you promised to give me all your money.

Or even more formally

There exist meetings between us at a past time, there exists such a unique meeting which is first, and, for all meetings, if said meeting is indeed the first, you promised me at that time to give me all your money.

And this can be reduced to

There exists a unique past meeting between us such that [it's first, and you promised to give me all your money at that time].

I think this interpretation is most closely aligned with how "when" is actually used in practice. "If" feels different, though. It can act as simple logical implication, logical equivalence, or anything in between, so it may be more interesting to study. Also note that all of this doesn't apply to "when" + simple present, which acts very similarly to "if".

No, because you are always right.

You must gather your party before venturing forth.

I read it in "the Stanly parable" voice

I remember playing Baldur's gate on the GameCube but I forget what that sounded like.

"next week lottery numbers are......... impossible for me to know"

"the best thing I can do with my life right now is ...... something I wish I knew"

The curse can be stubbornly unhelpful no matter what.

It won't be easy as you'll still have to guess the right thing, but you can probably make it work.

The way this works in reality is with retrocausality. In the same sense that a molecule is controlled by a cell but still influences the cell, phenomequalitesselation is where God or similar conceptualization of retrocausal force (time travel) controls the unfolding of history, but our most human choices influence the strange attractor of the transcendental object at the end of the universe, so we have free will in a deterministic system, which is really illusory, like the self.

This pen.... Is ROYAL BLUUUUUEEEEEEE

No the pen 15 club is that way ---->

THERE ARE FOUR WISHES!

That or he started with 4 wishes

I mean, I get what you are saying, but also like every other comment is talking about how the wish goes wrong by not letting you speak something that isn't true and I just wanted to explore other ways the genie could "monkey's paw" the wish. ie removing the wisher's left half. "They'll be all right."

You somehow propose this to the genie through half a larynx, he nods briefly, before slicing again, and again, and again with increasing precision, until you are reduced to a single proton.

"I've read Zeno too," the genie replies.

I never said when that time was, or how long that time was. Not my fault you spent the exactly 3 seconds of time you were always right having a wank instead of being productive with it.

Still same boat, you are compelled to conform with whatever the actual truth is.