This rings hollow when these companies don’t seem to practice what they preach, and start by setting an example - they don’t halt research and cut the funding for development of their own AIs in-house.
If you believe that there’s X-Risk of AI research, there’s no reason to think it wouldn’t come from your own firm’s labs developing these AIs too.
Continuing development while telling others they need to pause seems to make “I want you to be paused while I blaze ahead” far more parsimonious than “these companies are actually scared about humanity’s future” - they won’t put their money where their mouth is to prove it.