Nat 20 doesn't just let you do whatever. Cure wounds could easily be interpreted as returning the body to its natural state as the soul percieves it. If wanted his legs back more than anything so much that his soul held onto it like phantom pain, then I would say maybe a Greater Restoration could if he wanted that.
But if he'd grown accoustomed to his new life and his new legs and no longer sought to "restore" anything, having made peace with his injury, then no, greater restoration would just restore him to his own healthy self image. And a spell like cure wounds would do absolute dick.
I'd love to let this play out, narrate the lack of effect of this spell, and kick this asshole from the table.
… Ranlar slowly rises from his wheelchair before collapsing under his own weight as his atrophied legs give out. Your party must now find a way to move him away from the orcs without using his newly healed legs, perhaps on a nearby chair with wheels.
I once ran a campaign based on Fred Saberhagen's books of swords. I'm the books there are twelve swords that would be considered greater artifacts. One of my players was playing a pacifist. He picked up the sword called Townsaver while his village was being invaded. Anyone who has read the books knows this same situation happens right at the beginning of the series. The sword takes over, because it's power is to force anyone who holds it to protect unarmed innocents. He proceeded to slaughter the invading force. He was devastated.
This thread has helped my understanding why new players I meet to are so intimidated by the game. It seems many people favor strict rule following over just having a good time.
Everyone's correctly pointing out how healing doesn't with that way, how about changing someone's body against their will being totally evil and not good?
I enjoy that Godbound doesn't even bother with any of the hairsplitting I'm reading in this thread. You're a god of freaking Health, of course you can fix his legs. No dice rolling involved.
"Fixers" are fucking annoying in any roleplay experience, I don't know what drives them to it but they never seem to get that it's not like, it's not like actually being crippled.
What an awful DM. I can't find any TTRPGs that have a "heal wounds" spell, and I definitely can't find any that have a player roll a d20 to see how effective their healing is, but assuming this is 5th edition D&D, this is within the bounds of Lesser Restoration. Still, I'd be pissed if my character had some medical condition as part of their story, and another player just cast a spell to get rid of it