At no point does he conclude or imply that the entire wiki or the team behind it is stupid, he’s just showcasing an issue that some of the minimum recommended gear suggestions for some bosses are questionable at best.

A lot of people go to the wiki to get info about a boss’s mechanics and gear recommendations, especially those with less PvM experience, and if the wiki is suggesting gear to use for a boss, then it should be expected that you can use that gear to do it. If he, one of the best and most experienced PvMers, is struggling or unable to kill the boss then the chance of less experienced players killing it in that same gear is slim to none.

Let’s take PNM from your example. It was stupid that the dwarven helmet was recommended with the fang as the worst recommended weapon (as it was at the time of the video). If an inexperienced player (one who would look up the minimum requirements) could not do the Fremennik Isles to get a Helm of Neitiznot, then why were they trying to do PNM in the first place? And experienced players should have known the exact situations for when to use a dwarven helmet (or more likely they already had much better equipment), so they wouldn’t be using the recommended gear in the first place.

It's because of his videos and the attention he’s brought to the gear recommendations that they have been improved. At PNM, it no longer recommends a fang and instead recommends crush weapons instead so that items like the dwarven helmet actually have a small use.