Well, I agree with him on the ABS, but I'd never sell a vehicle with such a fault. It's not only bad form, most people can't drive without it. Selling a car with malfunctioning braking systems also invites a lawsuit.
It's okay to paint a frame, so long as it's been thoroughly brushed and cleaned beforehand to eliminate any active rust. Too many people "fluff" them, though, in an effort to hide damage. The worst part is when they aren't careful about it, and get paint all over the damned undercarriage.
It's a shame when people let a car get that bad; especially a Land Rover. That's why people get the idea that they are unreliable pieces of shit. Owners don't take care of the damned things, and maintenance is critical on these outdated vehicles.
...As for the fuel door...
Mine never worked properly, so I removed it. It never made sense to me, anyway. Why should I open a door to open a cap?
Nobody is going to steal that shit, and even if they planned to, those doors can be pried open with a damned Popsicle stick.
Cheers,
Kennith