This should probably go into the FA v FM thread but I am taking it here first to see if FA's fans agree with the assessment of his technique as this is an assumption that needs some kind of verification before posing the question in the other thread.
I'm not so convinced. The explanation seems to make sense on the face of it, but on further thought not so much. Reason being that the Renault actually had immense front end grip. Alonso would barrel into a corner and use the prodigious grip from the front tyres to rip the steering wheel towards the corner and the front end would do just that. Then he would get the car pointed in a straight line joining the corner entry, apex and exit and floor the throttle and use the Renault's famous superb rear traction to power out of the corner. The Renault didn't have a huge amount of lateral grip from the rear tyres as compared to the fronts, but it did have amazing traction so as to get the power down and hence a great exit out.
That's why I don't buy the theory because if the Renault was an understeery car, there is no way that going deep into a corner and hacking at the wheel would not induce excessive understeer. The method of driving an understeery car is to actually get it turned in nice and early and continue braking deeper into the corner which transfers dynamic weight to the front and increases front end grip whilst unsettling and reducing the rear end grip. With the car now turned in, the braking can be reduced/power can be added to gradually transfer the balance back towards the rear and power out of the corner.
With an oversteery car, the opposite is better - brake late and hard in a straight line, turn in sharply to hit the apex** which lines up with the corner exit.
** there is no such thing as a perfect apex to the corner as is sometimes mistakenly thought. It depends on the point of turn in and the line of exit out
I think you are right and that the quoted analysis is too simple. In the Renaults, Alonso seemed to do what in sports cars induces oversteer: counter turn, turn in more than needed and break hard. In normal rear traction cars this is the way to begin a powerslide. Alonso never powerslid, though, and I never really understood it. It may have been a way of dealing with an understeery car by nailing its nose to the ground on turn in, but I am not sure.
During his Maclaren year, Alonso drove a neutral car, and adapted very well, even if he sometimes lost the front when trying really hard. The Ferrari behaved in intermediate terms, and Alonso had a lot of visible oversteer in some corners (but it may have been due to carrying too much speed into them). From Massa's way of driving, it seemed the car was neutral to understeery.
So Alonso's style seems basically to change a lot. The only thing I notice in every car is that he is not particularly smooth with the steering wheel: he makes large forceful corrections, but that means what?? He is quite fast in the rain, so there certainly is no lack of precision.
As he can drive a problematic car quite fast (for instance, with no clutch) I would say that he is always on edge and adapts to whatever he is given. This is done in a different way from, say, Schumacher or Hamilton (lots of large corrections and lots of small corrections, respectively), but it works just as well.
I'd like to talk to an F1 driving engineer: nowadays everything is too fast for us to appreciate visually (and auraly) unless in super slow motion and with all the computer data, which we very seldom (if ever) get.