Word of God is not canon. What's on the screen or on the page is canon. Word of God is supplementary material that you are welcome to incorporate but you are not obliged to. We do not live in a universe where Greedo shot first!
Actions speak louder than words. People don't always say what they mean. They don't always know what they mean. When they try to explain their motivations after the fact, they may get them wrong or they may not be able to admit their true motivations. That applies whether you're taking a Doylist or Watsonion point of view.
Just because Kubo or Yuuri says, "hey, looking at these matching gold rings that canonically engaged couple JJ & Isabella are wearing makes me want to go buy a matching set of expensive gold wedding bands to wear on our wedding band fingers and exhange them with Victor on the steps of a church -- it will be just like that time my high school handicrafts club sewed matching bookmarks for everyone!" doesn't mean that was actually Yuuri's motivation, even if Yuuri tells himself it is. Or Kubo tells us it is.
People can't always articulate their feelings. One anime scene that strongly impressed me in years gone by was in Nana. Early on, Hachi and her boyfriend are away on a trip together. She asks him to tell her that he loves her. At first he says, "Don't ask a Japanese man to say that!" But he can tell she really wants to hear it, so he starts psyching himself up to it: I'm an American. My name is Michael. But he still can't say it and in the end, Hachi says it's okay, she heard him say it in her heart.
Obviously, not everyone will have that much trouble speaking about their feelings, but it's something to keep in mind.
Your interpretation is valid. I can interpret Yuuri and Victor's relationship in a lot of different ways and I really love that. You do you.
Personally, you will never convince me that Otabek is a DJ.