I have looked carefully on the web for some sort of confirmation that Van Air's AOC has been revoked. I am unable to find anything to confirm this. As a Czech airline, I imagine the Czech CAA would want to publish any revocation of an AOC on their website - nothing obvious appears as yet on the Czech CAA website
I suspect that a journalist at Manx Radio has got confused with the UK CAA blocking air transport permissions in the UK, with the AOC which would be under the jurisdiction of the Czech CAA
If Van Air really had lost their AOC, I imagine the UK and IoM CAA would very quickly prevent anything with a V9 airline code from operating. Flights were still operating for Citywing under the V9 airline code in the early evening of Wed 01-March
Edit - just noticed on flightradar24 that the Anglesey-Cardiff flights which used to be operated by Van Air under a V9 code were operated not just by North Flying using a 19-seat Metroliner, but rather more surprisingly they went under a M3 code and not a V9 code.
https://www.flightradar24.com/data/aircraft/oy-npe
Conversely, flights to/from the Isle of Man using a 34-seat Saab 340 show up on FR24 as operating under a V9 flight code
https://www.flightradar24.com/data/aircraft/sp-kpr