The audio logs put out by CBS in connection to the show unequivocally say he was. additionally Terry Matalas made it clear that Worf was Captain of the Enterprise. This isn’t a “I would like to see” or “If I could” moment. This is hard and fast.
Sorry, but it is anything but "hard and fast". As others have ably pointed out in the thread, "canon" is only what's on-screen. The musings of the showrunner and the release of supplemental material on social media don't cut it.
This is, basically, Matalas's "headcanon". You are free to like it, and are also free to accept it as your own "headcanon" too. (As a fan of the novels, I certainly accept it as part of mine.) But as far as "canon" goes, it doesn't become such until some future show/movie references it on-screen.
Note that saying it isn't canon doesn't mean it never could have happened; it simply means it's not established yet, and future writers can go in any direction they please.
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