Yeah he has no screenshot saying he got in trouble for advertising enchanting in the Trade Channel. He has a text quote where he claims it was related to his penalty but I am going to bet we are not seeing the whole story here.
Advertising Professions in the Trade channel are fine. That is what it is for. SPAMMING them is not so if the he annoys enough people a GM may agree it feels spammy.
Again, that whole bit about the wrong channel is not even a screenshot and no proof it is connected to his account action, or that it is connected to Enchanting.
This is all a one sided reddit story… Never ever take the internet at face value.
Awesome that you are asking for policy clarification though. That is what this forum is for. It is an Info Desk to explain policies, help folks navigate support tools, etc. We also have coffee.