Pure Speculation - None of this is confirmed - Don't spread rumors:
I'm actually really curious if Gigaton Hammer's treatment is unique to that lone move or if this might be a change to Hyper Beam style attacks in general. That style of attack's been regulated to boosting other attacks like max and Z-move for the last two generations. They're fine, I guess, but my inner elementary school child kind of wants the super cool omega attacks to be actually super good without other strings attached in competitive. A change like this might be a neat way to make some of the flashiest attacks in the game far more usable, though doing that in the game with triple stab might be uhhh a little risky to say the least.
If anyone can catch a use of Hyper Beam or a similar attack to see how it works, I'd be thrilled.
Mentally the pokemon tcg part of my brain turned on reading that attack too lol. It really is from an entirely different game. Now let's get garbotoxin as Garboder's ability!