Anonymous doesn't mean invisible, it means without connection to an identity.
The only identity that you have on chain is an address, which most people would consider equivalent to anonymity.
If that identity belongs to your ISP or a VPN or something else is irrelevant, as that would be anonymity on the IP level rather than the level of the Bitcoin protocol.
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.
Offchain.
> companies like chiphertrace actively tracking them
Mostly without attribution, which people would consider anonymous.