++ The experiment does indeed demonstrate the Magnus effect,
although not very cleanly, because of the squirrelly winds.
-- Later in the video, the "explanation" of the underlying
physics is garbage.
That site purports to offer Ve, which stands for
"Veritasium, an element of truth" ... but in my
experience the site provides a rather large amount
of Bs.
The site explains the Magnus effect in terms of "separation".
In reality, separation has got nothing to do with it, and
indeed the Magnus effect works /better/ if there is little
or no separation.