It is contradictory and I don't think anyone has a definitive answer. Well, let me restate. Plenty of people think they have a definitive answer, but the problem is that there are just too many damn examples to support both sides of the argument. These people generally like to make the claim that anyone getting results with the opposite way of training from what they support is either (1) a genetic freak (2) on steroids. This is a convenient way to deal with anecdotal examples that don't support your ideology of training. They are all just outliers that should be discarded.
I wrote an article about this not long ago. Here is my summary of my opinion on the matter.
1) There are obviously people who have a lot of success with both ways of training. There are genetically elite guys who train with minimal volume / minimal frequency. There are genetically elite guys who train with lots of volume / lots of frequency. There are chemically enhanced guys who train both ways. There are "average guys" who train and get results both ways. So let's just accept that both ways CAN work and move on from an either/or argument because its pointless.
2) My experience with athletes who are highly neurologically efficient / explosive / good athletes can do more with less and don't need as much volume/frequency as more "average" athletes do. I have a 20 year old shot putter that throws at OU who I've been training since he was 14. VERY EXPLOSIVE. We make our best progress training each lift heavy once per week with one work set and one back off set. But his worksets are all in.
3) Most late intermediate /advanced lifters probably do best with alternating periods of higher volume / higher intensity rather than sticking with one approach all the time.
4) Anecdotally....going back to the 1990s when I started training in serious strength training gyms, I have seen far more examples of big/strong lifters who trained on lower frequency split routines rather than high frequency full body routines. This is not an endorsement, just an observation over 20 years of living in gyms.