I don't get what actually changed....
(It was like that last year)
You give it a spoffed / call forwarding / temp number and make a fake name
It feels the same

"If you don’t want to hand out your phone number to chat with someone on Signal, you can now create a unique username that you can use instead (you will still need a phone number to sign up for Signal). Note that a username is not the profile name that’s displayed in chats, it’s not a permanent handle, and not visible to the people you are chatting with in Signal. A username is simply a way to initiate contact on Signal without sharing your phone number."


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