Very true, a Caterham is not a Lotus, its a Caterham.
The name Rotus is obviously a play on Lotus, but that says nothing about the car itself. The reality is that there are many, many, many front-mid-engined sports/racing car designs in the world, but very, very few, perhaps only four counting Lotus, that directly mimic the Lotus 7. Others that claim linkage to the 7 claim that they've come up with a better way to do it. Nothing wrong with that, but its not the same.
Don't think that's being "uber-purist", just accurate.