Dar I don't think that car "handles like a pig" at all.
If oversteer at the limit doesn't equal "great handling" then does that mean understeer does? From what I'm seeing the car is balanced enough to zero counter through many corners. Fact is you wont see understeer in such a video as much as oversteer.
His style is not "SLOW" driving in that way and in fact it's recently been proved through time trials; 98-100% grip driving VS 100-102% racing drift and there was virtually nothing in it.
I don't think the driver is having any confidence issues. The car is behaving in such a way BECAUSE he's on the power earlier AND holding more into, than any pure grip driving would allow.