PRIDE had a heavy pro wrestling influence initially, the entire promotion was started based on the popularity of pro wrestling. The early PRIDE events had some "worked" or fixed fights. But that really only lasted for the first few events, you could typically tell a fight is fixed by watching the fight, which seems like a lot of people on this forum don't actually do.
Based on actually watching every single PRIDE event in its entirety, I would say that the way Gary Goodridge (who's much more credible than Chael Sonnen, who wasn't actually there during the PRIDE days btw... Chael is just stating his troll-y opinion, no different than anybody giving their opinion on this forum tbh) described it seems to be the most accurate. He said PRIDE 1, 75% of the fights were fixed. PRIDE 2, 50%. PRIDE 3, 25%. PRIDE 4, 10%. And it just kept going down from there. Past those first 4-5 events, it's hard to pinpoint any other clear fixes. Not sure if those numbers are accurate, I would say they aren't entirely, but if you watch those shows, you could pretty much see which fights were fixed and which fights weren't, and the number of fights that were fixed do seem to go down the way he described it, until eventually, every fight was legit. If you watch the shows beyond the very early days/first few PRIDE events, you really can't say any other fights were fixed.
So I'm not sure why some people genuinely believe that *most* PRIDE fights were fixed (well I am sure, it's because MMA fans are morons) ... it was like 5-10 fights in the first few events, and that's it. But just watch the fights. Unfortunately, those early fights gave PRIDE this false reputation for putting on "fake" fights. The early UFCs had some fixed fights as well, for the record. Doesn't mean anything. Again, I would love it if people would just watch the fucking fights instead of talking out of their ass.