If Perot was in the 92 election for a vendetta against Bush,
why was he in the 96 election?
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.