I don't trust any rumor that depends on a search engine, especially one with an algorithm that changes whenever you search up something.
The searches only work correctly(and not always) on 100% clean searches(that means removing all your website data/cookies/etc.) So that's not an actual issue because if you search something else, then you cannot apply the theory.
I don't trust it regardless, but that's because there's no reason the other ads would be out by now outside of Joker's. It's possible a Nintendo employee screwed up, but it's also a little too weird it only works on clean searches. It's probably just a faker making ads, which puts them in a ton of criminal trouble(false advertising, literally impersonating multiple companies, and possibly could make it so people don't bother with the Fighter's Pass due to being disappointed when it's not real. Though the last one isn't going to be a huge factor, it's enough for Nintendo to also take action. That's a grave misuse of their overall IP(the Fighter's Pass itself), as well as misuse of multiple companies' IPs).
To say the least, if it's real, at worst an employee just screwed up. That was it. They could get canned or disciplined. If it's a faker, they're in a ton of legal trouble. It's a pretty huge criminal act what they're doing, after all.
FF music is most definitely in copyright hell and the blame is 100% on Square-Enix. FF14 wanted a rhythm minigame that used older music and then Square stated it would cost a pretty penny, despite the fact that Nobuo Uematsu is on the FF14 sound team and composed those old songs. I don't know how the assets work but considering Nomura seems to enjoy doing guest work (Xenoblade 2, the new FF14 expansion, etc) I don't think he'd be the reason we have no FF spirits. Hell, we didn't even get spirits of the summons in Midgar, which are already beautiful png files.
Nobuo owns the music, not Square-Enix. If he says no, then they can't do anything. They do not get instant access to it just because he's on the sound team. That's not how it works. They have to license his music to use it in their games. So yeah, it's not really their fault unless you count them not willing to spend a severe amount of cash on music because one person overcharges. But that's really more on Nobuo for not willing to compromise as is. This is the same reason we have few FF songs. He charges an arm and a leg for it. And he directly composes music for Smash games itself, meaning that he doesn't heavily compromise whether he's on the team or not.
Don't get me wrong, I do like the fact that they give more credit and money to the people who created the product directly, but it's taken a little far in some cases. Albeit, it costs a lot of time and money to make a lot of these products, so it's kind of hard to distribute money among employees fairly too. It sucks for those who want SE content, but the employees are often getting what they actually should be paid for their labor.