No, he's saying that they would lose grip at a higher speed than the cheap ones, as he probably won't be able to judge grip any better with them.
You've got to either drive like a complete **** or be running Ditchfinder Specials on each corner, surely.
The tyres on the front were Champiro somthing or others, they seemed good enough until they let go of the road...
could have bent the subframe, though chances are the full corner will need changed. If there are no signs of what part is damaged it could have easily caused small problems on all of them. I hit a kerb in my ctr resulting in the same thing - wheel in at the bottom, out at top. Insurance changed the shock, spring, wishbone, wheel hub, and track rod end. Fortunatly the sub frame was fine.