I think looking at the mod itself and comparing how much damage robots can take compared to humans, I say that the mod is balanced, if it makes Robots a bit weaker than humans by health alone. The biggest thing is that humans can slowly heal damage over time, while robots can't. However, because robots can't heal over time and are immune to oxygen and bleeding, they can't die to passive CPR, requiring teammates to maintain them once they go down.

I will suggest one thing, which I'm not sure you can do, but maybe you could rename the converted damage types to fit a robot. Here are a few examples I can name:
Bite Wound - Bite Damage: "Chassis is displaying punctured and dented areas, exposing parts underneath due to wildlife exposure."
Blunt-Force - Metal Dent: "Parts of the body are irregularly bent and inward."
Internal Damage - Circuitry Damage: "The unit's internal systems are either destroyed or damaged in some way."
Gunshot Wound - Firearm Damage: "The chassis seems punctured with missing parts. Shards of lead are present in the mess."