You probably haven't followed Tor development in the past years. obfs4 and snowflake a really cool circumvention methods that are orders of magnitude harder to detect and block than these "signal" TLS proxies.

The TLS proxy signal just advertised uses plaintext TLS SNI header to determine where to route the packets, which makes it really trivial to detect and/or block. The same cannot be said about tor.

I’m familiar with obfs4 and snowflake.

Signals TLS proxy is naive compared to obfs4, but at it’s core it’s a similar solution.