That really means nothing. Even if they use the same actor, that doesn't canonize the show. At most it means that someone involved in the movie liked the actor enough to hire him for, what, 15 seconds of screen time and I don't even know if he had a line.
Anson Mount played Black Bolt in Doctor Strange 2 but that doesn't mean the terrible Inhumans show is canon. In fact, having Kamala Khan not to be an inhuman pretty much shows there's almost certainly no Inhumans in the MCU, and if they are they don't resemble all the stuff Agents of Shield did with it.
They could literally make anything they wanted canon and I suppose, but it's about the likelihood. I put Agent Carter at about the same level as inhumans when it comes to shows they could technically canonize but probably won't. Honestly think that the horrible Iron Fist show has a better chance of being canon, just in case they want the Defenders to count.
Agent Carter is a show that Kevin Feige was actually directly involved with, it involves multiple characters carried over from the movies and had a character that was introduced in the show appear in the movies (and not as a character in a far flung alternate timeline like Anson Mount) and its storylines have never been in any way contradicted by the films.
You have no reason to consider it 'de-canonized' other than the fact that you personally don't like it. This is the definition of wishful thinking.