I have heard many conspiracy theories regarding the league's curious assignment of referees in pivotal playoff games, but nothing like that. I'd appreciate the source of that story.
The games aren't fixed, but the refs are under orders to try and direct the outcome. Its a bogus, faux league.
More damning than the shenanigans with the refs is the way that after Shaq-less LA got off to a slothlike start in 2003, NBA commish Stern suddenly made an announcement that the first round of the playoffs would be seven games instead of five.
Source of the story? I heard an audio tape on the radio.