Well this certainly makes what Parag did make sense. The market conditions have essentially dictated that Musk is now massively overpaying for twitter, and he's doing it from a weak position with the value of Tesla dropping. It would be insane for him to close at this price, and the other people who bought in to finance it will also be very hard to keep on board. So Musk needs to walk away at this price. The question is whether he can either find an out that doesn't involve paying the break up fee, or bully Twitter's board to accept a lower price. Given how Parag is behaving I think that's unlikely.
It's important to remember though, if Musk walks away and then comes back with another offer it's going to be extremely hard to convince of a new deal, since Musk no longer has any credibility.
The other thing to consider is that no one else wanted to buy Twitter for $45Bn. But let's say Musk walks away and Twitter drops back to where it should be at around $25 per share. Now you could easily see someone coming in and picking it up for $35-40 per share.