TBH, both of these options are not really that great unless the move receives some slight buff to make it work better:
If it remains as a non-moving reflector, then it needs a better reflect hitbox so that you don't end up clanking with the hitbox you're trying to reflect. Also, it should start up and end faster so it could actually be on par with the other reflectors in this game. As it is now, it's even worse than Ganon's, lolz. If it had all those things, then it wouldn't even need a damaging hitbox, let alone the almost useless one it has now. The move would simply perform its situational and non-polarizing job of reflecting projectiles without becoming an annoying/unfair approach option.
However, if it's gonna be a non-reflecting tackle, then it needs an actual
reason to use it. Before, it was great to approach with alongside a reflected projectile, and sometimes it was okay to do so by itself at high %'s because it caused knockdown. Without a reflector, it needs either stronger hitboxes so it's always safe on-hit, faster start-up so it kinda functions as a GTFO tool, or much lower cooldown so that it can transition smoothly into combos/pressure. Obviously, if you gave the move less start-up, it would require more cooldown to balance it, and vice versa.
I would be happy with either of these choices, so I can't really answer the poll, lolz.
I assume that since the boosts along the ground count you as grounded for some reason, but with aerial options, the answer would be yes; but theorizing on something that doesn't even exist in game and is heavily affected hard to account for factors like ECB positioning isn't really worth the time
Sorry, what is "ECB"?
Wouldn't such a boost simply count ROB as 'airborne' at the lowest possible point, similar to Peach's float (yes, she's airborne because she can't be hit by ground-only moves, such as the part of Melee Samus' tether grab that isn't on her arm cannon)?
Also, there is actually a very practical reason why, IMO, the PMDT should never want to implement a 'grounded robo-boost' sideB, and the reason actually comes to mind easily if you think about Peach's grounded float. She suddenly has access to moves that are +4 on block because she can FC her aerials
immediately at ground level. However, this is not ridiculous in Peach's case because she is slow. This part of her design isn't 'bad' for the game because it's simply her receiving great lockdown potential as a reward for going through all the work of getting in (more characters need rewards like this). However, extrapolate this type of situation to ROB. If ROB could get immediate aerials from a 'grounded boost' like this, I can only assume that it would also have the boost to damage (and thus shieldstun). This would only serve to further antagonize the problem that, as I understand it, the entire PM community besides us has with ROB - the problem that he has airdashes that are 'hard' to react to and deal with. I would imagine this is also why he can't initiate a dash below a certain height above the ground (this is actually a very common mechanic in anime fighters with airdashes).
Edit: I'm not sure if ROB's fair would come out so low to the ground, but even if it didn't, he would be able to transition into no-impact land for some nasty stuff straight from a grounded position. Not sure if the game needs stuff so potentially polarizing right now.