You have no proof how strong Robin really is, soooooooo unless you prove it, that's a false statement!
What is this, a court? Ha.
Here's the clostest thing I got. Enel and Odz. With Odz, Nami was off kidnapped while the SH crew, in this case including Robin, was attacked by Odz. When Nami did join in the fight, she avoided all damage.
And I mentioned Enel because it's virtually the same thing. Robin gets zapped through the head while Nami plays the role of scared hostage.
The point I'm trying to make is, for some reason, Nami avoids damage while Robin just…doesn't. From this I infer that an attack from Enel or Odz would either KO, kill, or disable Nami for the rest of the arc, while apparently Robin can take it. Nami's endurance is the lowest amongst the SHs, and if she was "KOed" during the first Odz assualt she wouldn't get up. She apparently has the most human endurance of the SHs. Notice she never even got hit in that battle.
So, from this I infer that Robin is physically stronger then Nami, and in the event these two get in a fist fight--no DF no Climatact--that Robin will overpower her. She's made of stronger stuff, and I'd personally rate this and her experience in the underworld and her 10 years more age would make her the winner in this rare circumstance.
Also, what's all this talk about rabid Robin fans? I haven't seen one, or at least haven't noticed them. I just see people trying to give Robin a fair chance. In my case, I'm not evening comparing Robin to another SH...except Nami. But, I guess I never saw brennen.exe coming.