I think it's great! I don't know the pianist, but his cadenza is great fun, and that's ok, surely?
Yes I agree the cadenza is fun, and big bands have been swinging the classics since the 1930's, but I'm not keen on a swinging cadenza while the rest of the concerto is played exactly as normal. It's just a bit of showmanship from Breiner, and I would not have appreciated that performance live (it was performed in Kosice in 1990).
Ditto Gilles Apap, it's fun after a bottle of wine but for me, if the rest of the concerto was normal it would just spoil it.
He does similar things with Mozart Concerto candenza's, in an even more extravagant way...
Eh, the examples ARE Mozart

John W