If there's one sure way to spot a spoofer, it's this "I've been watching X for years, this stuff is second nature to me, you don't know shit about boxing" type nonsense that this guy is spouting.
Anyone who ever approaches anything resembling a level of expertise in any area knows one thing above all others, what you know is just a drop in the ocean compared to what you don't know. Education, as they say, is the progressive realization of ignorance.
If guys are boxing experts, they don't need to tell you that they're boxing experts. The way they talk about the sport leaves you in no doubt. Anyone who spends their time telling you what an expert they are instead of just showing you through their analysis is almost certainly a bullshitter and not worth your while listening to.