I don't get it, where was there a reference in either your or Futurka's post? Futurka only mentions that Tomino doesn't want to sign Gundam stuff he wasn't directly involved in, because funnily enough in 40 years he didn't personally make all the Gundam spin-offs. It's equivalent to George Lucas not wanting to sign your copy of The Last Jedi. This isn't a reference to people trying to get Tomino to sign random giant robot stuff such as FLCL models, just non-Tomino Gundams. People just haven't done their homework about which series he actually made, so since he's the "Gundam Guy" they want him to sign their Gundam merch. It is official Gundam merch, it just had nothing to do with that guy.
Is there some reference that's going over my head in your post? Because "tominoesque sorta thing, calling it Gundam when really it's just giant robot anime" describes literally dozens of different franchises, not just, and not especially FLCL, since FLCL isn't a "tominoesque sorta thing" at all, since the robots aren't mecha in that, they don't have pilots, which is the key "tominoesque sorta thing". A "tominoesque" thing isn't a thing with big robots in it, it's a military drama focusing on pilots, who happen to pilot human-shaped mecha. They could be tank drivers, or fighter pilots and the story would be exactly the same.
FLCL is a nod back to the pre-Gundam "super robot" genre in which the robots were self-controlled, such as Giant Robo, Gigantor etc. This was the whole thing that "tominoesque" series were an innovation away from.