Probably off topic but is it an "ASMR" type thing? I only ask because guided meditation audio/video tracks are very popular in that area.

It's not 'pleasant' enough for that, plus I'm not sure this 'ASMR' thing works with voices.

Rather, it's a combination of his accent and the 'meditation voice' thingy that just makes it sound nice to me. His voice is meditative enough to not feel like it interrupts, but "blokeish" (a certain British accent, I guess) and distinct enough that it doesn't feel too high-falutin and triggers my still rather primed anti-everything-new-agey senses.