You do not need an IP to broadcast a transaction, you could feasibly do it on paper, or broadcast through a remote node or overlay network gateway through TOR, I2P etc.
Have you done this? You know of anyone who have done this? I know in theory it's possible to do, but claiming it's "feasible" I'm not sure is accurate.
> broadcast through a remote node
Which requires you to connect to the remote node, again using the traditional TCP/IP stack.
> overlay network gateway through TOR, I2P
Yeah, that would mask your IP, but IP still required, meaning your anonymous on the IP level, just like I argued in my previous comment.
While the context might have been lost these deep in the thread, I was simply trying to rebut "If I can't get Bitcoin anonymously, how is the promise of crypto still valid?" which WA wrote earlier.