I did check on archive.org, and the code of conduct is there on March 2025. So they didn't just add it in the last month or so, and then send this notice.
The CoC section seems to have been added sometime between Apr 8 and May 18, 2022 and unchanged since then.
From the Code of Conduct:
> Unacceptable behaviors include but are not limited to: offensive comments, insults, jokes or ridicule; gratuitous or off-topic sexual images or behavior in spaces where they are nor other unappropriately aggressive behaviors; threats of violence or deliberate intimidation; creating additional online accounts in order to harass another person or circumvent a ban; harassment of any form.
I can't help but wonder who decided that, in an electronics forum of all places, *any* form of joke should be unacceptable, but sexual images are only a problem if they are gratuitous or off-topic!