This is another example of traditional science screwing everything up because they keep putting "normal people" into these studies.
Trust me, take a guy who's on TRT and who's working out 4 - 5 days per week and eating tons of chicken and beef, and then measure his bio-markers. Then add some fish oil into the mix and measure those markers again. Cholesterol goes down, blood pressure goes down, inflammatory markers go down, etc.
So yeah, maybe fish oil doesn't have as much benefit for the average person as a supplement.
Bodybuilding science has always been 15 - 20 years ahead of traditional medicine, and it will always be like that. 20 years ago Testosterone was demonized by traditional medicine but these days, TRT clinics are everywhere handing out prescriptions daily because we've now learned that the health benefits of maintaining your hormone levels as you get older far outweigh the risks associated with it.