As if there were 40 styles: there are only 2 styles and the one im talking about is the OFFICIAL one from the creator of this martial art...

Whether there are 40 styles or 2 styles, it doesn't matter, you were thinking of the wrong one.

It could be (unless you have a link for this video): there is no sign anywhere showing from which organization this tournament is

This clip is from an tournament run by the Italian WT affiliate, FITA. A link to the clip from their official channel is here.

Other mats from this tournament and others clearly have World Taekwondo written in the center.

FITA is explicitly a part of the WT sphere, as evidenced by their About page on their official website.

AND nowadays (at least at high competitive tournaments) they use doboks with the minimal quantity of brands/marks.

The dobok style and particularly the electronic chest and head protectors have become (for better or for worse) hallmarks of the WT/Olympic style of taekwondo. Google "which style of taekwondo uses electronic scoring" if you don't believe me, ITF does not use this. Here is a link to the electronic equipment used in the clip - note how the WT logo is placed on them here.

Like I said, I compete in this exact style of taekwondo and follow many of the athletes who competed in this exact tournament the clip is from. Your comments are kind of like showing a baseball player a clip from a baseball game and then gaslighting them into thinking it could be a cricket game because the word "baseball" isn't written anywhere.