Supposedly the entire accessibility team got laid off [1], so there might not be anyone left to ensure that changes to existing features do not reduce accessibility nor ensure that new features are accessible. Not that I'd expect Musk to care a whole lot about concerns raised in that regard, considering that he supposedly went ahead with Twitter Blue despite significant (and well warranted) concerns from the Trust and Safety team [2]. So Twitter will probably become less and less accessible over time.
[1] https://www.wired.com/story/twitter-layoffs-accessibility/
[2] https://www.businessinsider.com/twitter-sent-musk-risks-paid...