Comment by jcul

I was wondering about that too, I think the wording is just a little confusing.

Further down it says:

Selecting “Nobody” means that if someone enters your phone number on Signal, they will not be able to message or call you, or even see that you’re on Signal. And anyone you’re chatting with on Signal will not see your phone number as part of your Profile Details page – this is true even if your number is saved in their phone’s contacts.

So I think what they mean is if you've been chatting with someone before this update and they have already linked your phone number and signal account then setting to nobody won't revoke that.

However if you initiate a chat with someone new using your signal handle, even if they have your phone number stored, they won't know it is you.

Otherwise it seems like it would be easy to brute force someone's phone number!