Unlikely because bot operators don't care about their comments once they are sent. They usually spam their shit without caring about the past.

Absolutely no way of knowing.

When using local models for coding, it frequently edits the same files repeatedly until it's satisfied with it. But that's what the prompts built into the coding harnesses tell it to do, in case its first pass doesn't compile properly or doesn't satisfy all the necessary functions.

So to answer your question, it depends on what model you're using, and what instructions you've given it, what goal it's trying to achieve and what guardrails apply to your harness. If your harness does not allow it to edit comments then it won't. Otherwise, it certainly has the capability to, and if the goal you've given it can be achieved by editing a comment, it certainly might. For the purposes that most bots are used for on social media, it doesn't need to, and it probably won't. But if someone wants their bot to act human for whatever reason, then they might have it do that occasionally or maybe frequently.

Honestly it's a good idea IMO. The thing is, if it becomes common wisdom that edited comments signal credibility, then spambot makers that want them to look human can easily program them to do that and take advantage of that common wisdom. At that point it wouldn't be a useful signal anymore. That's the nature of a cat and mouse game like this.

But for the time being? It sounds like a reasonable heuristic to me. But just like everything in this area, no single thing is 100%.

it would think

AI has no brain, it doesn't think. It is a computer program.