Star Fox 64 was a reboot of the series after that initial SNES game. Star Fox Assault and Command were unique games. I think they took place in the same universe as SF64, just later in the timeline, but I don't actually know for sure. Star Fox Zero was said to have been a reimagining of Star Fox 64, if I recall correctly. But it is its own unique game too. So yeah, another reboot. Star Fox 64 3D for 3DS was a complete remake of original Star Fox 64. Same game with all new assets and engine, but plays more like a remaster. This new Switch 2 game is another remake, with the same level layouts and everything as the original game, but looks like it's gonna do more than the 3DS game did, with expanded lore and features and whatnot.
EDIT: I forgot about Star Fox 2, which took place in the same universe as the first SNES game, after the events of the first game.