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In the video Andreas Levenko made he quickly flashes a half second disclaimer as below
He did admit it is a quick disclaimer LOL
Read it below
Unless I missed it Nowhere on this video do I see him mention Rule 2.47 & regulation 3.4.2.2
He does mention at the very end asking you to check with your federation or local rule.
How can national , state & local affiliates allow it ?
Boosting is a blatant violations of ITTF rules & regulations to start with.
I do not see what else is there to check
See his video below

To answer your question > Is the video illegal ?

I guess it depends on how , to quote Andreas himself, on how local authorities view it.

How does the Austrian government feel about this for example