Basically what he did, is publish a paper in the most prestigious journal without having definitive evidence. Someone tried to reproduce and got no results.
Then after a few years he tried to produce definitive evidence afterwords, but none cared to reproduce the experiment anymore.
And then afterward a team put together by journalist did give a (pretty weak) “try”, he did not cooperate.
Also the Fusion field is mentioned as very competitive.
First time counts the most.
I just hope I wont see a documentary about FF in a few decades, when ITER will be just 25 years away…