I mean, I get it when Whovians get a little upset when people call the Doctor “Dr. Who”…but
The Aztecs part. 1 with William Hartnell
It’s muthafuckin’ CANON.
Or we just know that it was a mistake made by someone who should have known better.
I think it’s like Cas v. Cass in Supernatural. It is actually canon, we just collectively ignore it.