Yes taking everything that Disney XD's promotional team says at face value has always been accurate and they have never once misled or blatantly lied to us to create hype and fandom drama.
And the description of an Instagram video must have been written by Nefcy herself and is canon gospel on par with the very words said in the show.>he's angry that she still isn't over Marco
That doesn't make sense with Tom's established characterization and how he's dealt with their relationship in the past.
If your argument hinges on "maybe they'll radically change characters in a very short period of time so it'll make sense for them to act this way" it's a pretty weak argument.>Actually it's not clear that they're trying to push her into marriage.
When you have a ball with all the unmarried teenage heirs of Mewni attending with their parents to be paired off in one-on-one romantic dances, the intent is marital diplomacy.
Star already mentioned in the guidebook that she felt pressured into a relationship with Tom because they're both royalty and their families are on good terms. This is medieval diplomacy 101.
And you completely sidestepped the question of "why would they do this now when they should have more important things to worry about?">we don't know that they are pushing her into marriage at all
When royal families get together and pair off their heirs, they're not planning a picnic.
I'm not suggesting they wanted her to get hitched right there and then, but it's never too early to start building relationships. And it makes more sense in the context of it being a flashback to when they first met, when Star was a royal brat and Tom could have helped set her straight. Everyone knows Star will be Queen one day and must produce an heir sooner or later.
It makes less sense in the context of the present, where Star clearly hasn't been pressured by her parents, and they had even assumed she was with Marco.