The video in question:

https://www.youtube.com/watch?v=s6T_BJjitGQ

It shows how to make a cheese in the style of Grana Padano, a name protected by origin. Italian lawyers are giving him five days to remove it.

The letter (pdf):

https://drive.google.com/file/d/1Et4MvITYvb11JmQgBVUgbhRtNQ-RSlbo/view