The accusation still sounds gross. Though vaccine rollout wasn't great in the bay area. I got an email from my doctor about appointments being available. The ones in the bay area were taken really quickly. Availability was much better in other counties. There were also a couple other replies. One mentioned you could get vaccinated for volunteering for 4 hours. Another mentioned some sites were doing first come first serve.
You're being charitable in the wrong direction, because you're not interpreting the allegations in good faith. What would be the point of taking to Twitter if all the second founder did was instruct people how to get a vaccine, without the component of lying to bypass the queue?
Since there would be no point to such an outrage, it's uncharitable to pre-emptively dismiss the contents of the allegations. Whether or not they are eventually shown to be true, they should still be interpreted in the most serious and direct way.
It's still partially true - the allegation of lying was wrong, but the allegation of instructing others how to lie is still being made. This is clarified by the tweet that you linked.