The Swine Flu also wasn't a variant of the seasonal flu (else the regular flu shot would have had some level of efficacy in preventing it); it still had to be isolated and researched and independently manufactured. You couldn't just inject H1N1 into a Fluzone suspension and call it a day.
Not my point, though. The point was that panicking about relaxed regulations is ridiculous is because those regulations are largely red tape. There are, of course, safety requirements and health regulations, but a lot of the wait time on drug development overall is bloated regulations and government inefficiency; the process has to be reviewed at every single step, which requires submission to government agencies, then waiting for them to get back to you. Even if everything goes perfectly you're in for a lot of downtime.
A new vaccine can be produced within months, but the approval process at every step easily doubles development time. Even the seasonal flu -- a vaccine which is rolled out like clockwork every year and is generally proven not to kill people -- has a roughly eight month lead time due to regulations, which is why the flu vaccine is based on best guesses from the previous year's flu season. The lead time is so long they have to make it in February and hope it's still relevant by September (and god help you if a second flu strain shows up).
Eliminating those regulations and prioritizing review doesn't equate to the vaccine being developed hastily and wantonly.
Of course, I wouldn't dismiss anybody's personal trepidation or say it should be mandatory or even try to convince anybody to go get one-- I'm not interested in getting a coronavirus shot, either. But saying that trying to get a first wave of a vaccine out by October is by itself a bad idea and must mean that they didn't test it is absurd. (Especially since they're talking about getting distribution approval from the CDC. The CDC kind of needs comprehensive testing information before they can approve something to enter mass production.)
Hmm. Laying down that infrastructure would add on to production time. That's fair.