I thought you quoted me, but you just mentioned me haha. Yeah, I don't know entirely about his track record, but he had his supposed "source" on the channel a week or two ago. The guy didn't show his face, but he is a french guy who is involved with some players who has dealt with Chelsea, and apparently still does. I am not gonna say that NiNiFC is 100% accurate, but over the last few weeks he has been getting news out a day or quite a few hours before any other source has confirmed pretty much the same or similar. Maybe it's coincidence, I don't know, but he has two supposed "in the knows" (including the French guy).
He also says that he cannot guarantee everything as football behind the scenes changes so quickly, sometimes within a couple of hours or an hour, it's impossible to predict anything 100%. I do think people should follow him and come to their own conclusions, but from what I have watched of him, I do believe he may actually be telling the truth about his sources and info. I would like to think I am a pretty good judge of character, and having followed his channel for a couple months, he comes across as a pretty genuine guy.