Yep, signals are signals, but I think it's quite complicated now. (In any case, this is still the embryonic era of LLMs).

An interesting point to consider: an author that goes out of their way to hide any LLM influence may actually be degrading the signal. Because in that case, you'll not see the LLM's etchings, and misattribute skill to the author under the belief an LLM was not involved. Complicated times.