Most of what you said is correct but, in this case, the post cannot be vouched anymore. Only [dead] posts can be vouched and this was (presumably) vouched enoug

Most of what you said is correct but, in this case, the post cannot be vouched anymore. Only [dead] posts can be vouched and this was (presumably) vouched enough when it became [flagged][dead] to have those tags removed until it was flagged more to be [flagged] again. Because it's not also [dead], it cannot be vouched anymore. I've seen that pattern progress a couple of times and it lines up with the posts I am actually able to vouch. Rarely, there are comments that are [flagged] but not [dead], which similarly cannot be vouched.