Taking 1/3 of the standard time budget to get back to you isn't ideal, but it's not "a documented lack of cooperation".

And if you find something halfway through the month then oh no two weeks to reply, that's basically a standard business interaction at that point.

Why are you interpreting clear communication of a window of downtime with 2 weeks notice as a "lack of cooperation"? That's what cooperation looks like. It's not explicit but my read was that they're not even taking a vacation - they're just doing the rest of their job, a lot of which is probably going to be shipping fixes for vulnerabilities that are already triaged.

There are no "rules" for responsible disclosure. We have guidelines that we have broadly accepted, but at the end of the day whether or not you discussed responsibly is in the opinion of your peers.

There's no such thing as "responsible disclosure on a technicality". Don't be a dick, and work in good faith to keep users safe.

Wrong, but thanks for documenting how uncooperative you are.