That doesn't explain the losses from left leaning accounts.
Maybe Twitter has started enforcing these rules universally, banned some accounts, which affected these numbers?
What seems more likely to me is left leaning people leaving the platform and right leaving people returning to it due to a perceived impending shift in the platforms policies and culture owing to the political views of the new owner.
It’s believable they dislike the change and leaving Twitter. I don’t believe thousands of them have actually deleted their accounts.
People are generally lazy. In my experience, this quality is universal, and applies to 100% of political spectrum. Closing an account takes quite a few clicks.
It’s much easier to stop using Twitter, and uninstall the mobile apps. Doing so doesn’t affect these numbers, at least not until the 6 months specified in the Twitter's “inactive account policy” document.