They have other options in practice. If they have the means to block Cloudflare, they also have the means to prevent Twitter domains from resolving. (DoH can be blocked too without a big outage)
They just need to send a court order to Cloudflare to have then block Twitter..
That is pretty much what already happened and Cloudflare already replied informing they will isolate Twitter IP range from the rest of the customers..
By this time tomorrow it will be blocked again..
when i posted they had already announced they would comply to the block, i wa referring to that..
that they isolated twitter traffic to 2 specific ip address that can easily be blocked.. the block is already in place for the big ISPs and the rest should have it blocked by the end of day..