You'll have to ask him.
The fact that he had a different motivation in '96, or that he had more than one reason to run for President doesn't take away from his well known hatred for the Bush Family in general, and George (Sr.) in particular.
If you read the entire article you'll see their relationship started in the 70's when Bush turned down Perot's job offer.
But they've kissed and made up since Perot endorsed W in 2000.
Perot hated Bush so much he was in the 92 election to keep him from being reelected, but he didn't hate him so much that he got into the 88 election to keep him from being elected in the first place. Then he was in the 96 election for some unknown reason.
Got it. If that makes sense to you more power to you.
As far as myself I've got better sense.