We are only halfway to people being able to build Metal-Boto and the character really hasn't shown up in the mini comics, so no one is really thinking much about him...

But Roboto's only appearance in Belly of the Beast (Man) is under Donatello's knife/wrench as Donatello tells Raph that he's turning one sentient robot into an entirely different sentient robot. 

https://imgur.com/a/bJNWBvp

It feels a bit like Donatello is a mad scientist making Tuvix.

That's just wild!

I know it's just a mash-up toyline, and they are just explaining one of the countless mashups. But WOW!