Shouldn't we stop advertising the .com link in our signatures (and put the onion link on both sides)?
Especially as the .com link is the first one, some may click that one, see it's not working and seek for another mixer.
I don't think it's permanently disabled, and clicking on .onion link with clearnet browser like firefox or chrome would also give you error page.
Better option would be to temporary add link to bitcointalk ANN page instead of .com website, and that first ANN post should also reflect that .com domain is disabled and .onion link should be used.