Elon already signed. There is literally no such thing as "putting it on hold." See Matt Levine's latest column, he can't even back out if it turns out there are more than 5% spam/fake accounts. [1] He's playing games because he's the richest man in the world and if you try to hold him accountable he will make your life hell. He's really shown his true colors these last few years, absolutely no respect for him anymore.

[1] https://www.bloomberg.com/opinion/articles/2022-05-13/elon-m...