In video narrator feels sorry for not explaining how to do it :)

Albeit ime this is something even kids do, not sure why it is "new"?

Edit: I may be referring to the Sidek serve it was based on

From reddit (also not 100% sure):

The sidek serve is an other technique and has been banned for some decades (not 100% sure, but the spinning effect was caused by hitting the feathers first , I think), whereas the new spinning serve resulted from spinning the shuttle with the fingers before hitting the cork.

https://old.reddit.com/r/badminton/comments/1e18zys/comment/...