You don’t need a whole accessibility team for a product to be accessible. It can be handled by raising the awareness of other product teams plus some central auditing, for example (Twitter after all is a pretty basic product, UX wise).
Someone needs to do that though. With the foremost experts sacked, and staff down with a half, who will bother?
Maybe the employees on the accessibility team were all useless and hated by the whole org? Maybe starting fresh with real accessibility experts is a better way forward?
There was no accessibility team before 2020, Twitter hired real accessibility experts to be on the team, and they have been responsible for a number of accessibility improvements.