It's popular right now because it's Christmas time. The video stimulates the yule log tradition for people who don't have fireplaces (most people) or don't want the mess of a real fire. A lot of people are off work right now, visiting friends and family, and want a nice seasonal ambiance.

https://en.wikipedia.org/wiki/Yule_log

It also used to air on TV in some region

https://en.wikipedia.org/wiki/Yule_Log_(TV_program)

I understand that it would be confusing if you weren't familiar with the tradition.