His claim that "traditional musicians don't use concert pitch" clearly indicates that he is NOT a traditional musician. He's just a wannabe from outside a tradition who doesn't get it trying to ape musicians he deems "traditional." It's a perfect example of a little knowledge (plus some attitude) being a dangerous thing.

It's not that traditional musicians won't tune to concert pitch, it's just that under certain circumstances they don't feel obligated to do so. They tune to a pitch that in some way works better for them than concert pitch.

The key phrase there is "under certain circumstances." If it is the traditional player's desire and intent to play solo, s/he can tune anywhere s/he wants. But a traditional musician knows that if you want to play solo you DON'T go to a public gathering to do it unless playing solo is a normal part of the activities. If it is NOT, then a traditional musician would expect that some tuning and retuning would be required until everyone is more or less together. Whether everyone would be at 440 is an entirely different matter.

Being a traditional musician is not simply a case of playing some tunes in a certain manner. It's knowing and respecting and trying to act in accordance with the "context" of the music as much as is feasible.

Which is not to say that traditional musicians do not include their share of jerks.