Why would you believe that? If that were the case what was the issue with Anthropic even about?
You, and your colleagues, should resign.
Imo the more ethical thing is obstructionism. Twitter's takeover showed it's pretty easy to find True Believer sycophants to hire. Better to play the part while secretly finding ways to sabotage.
You tell me why an employee would believe something convenient to them continuing to receive their paycheck