Looks like around 300 people who worked at Twitter were on H1B visas [1]. Let’s assume they were let go at the same rate as all employees and say there are 150 left. That’s a minority of the work force. People are choosing to stay for reasons beyond being trapped by visa requirements.
It was pure conjecture, idle speculation, a haphazard guess.
While most of us in this forum probably appreciate drive, technical mastery, and the creation of great things, etc., the reports on Musk's management style don't make for a compelling recruitment pitch.
[1] https://amp.cnn.com/cnn/2022/11/18/politics/twitter-layoffs-...