It's the best strategy for losing traders. That is all.
Nope. Most bitcoiners are actually holders. Otherwise, the price wouldn't be where it is.
Many bitcoiners may be holders but I think you fully misunderstand the point.
Well, it is hard to lose trading if you don't trade.
And I think it is stupid to believe that you can beat this market. Maybe some can, some are lucky, perhaps there are even obvious opportunities where it is stupid to hold, but all in all I'm convinced it is the best strategy for (nearly) everyone.
So, yes, maybe he is right

If you are slow and lazy Buy & Hold is a very good strategy. And it's stress-free (very valuable).
But it's far away from beeing the holy grail.