You don't have to wonder, he's on video talking about it barely a month ago: https://twitter.com/BBCNewsnight/status/1658234370409263106
Saying of course that brexit has failed but not because brexit was bad in it of itself, but because the British politicians are as useless as the EU Comission and that they've totally mismanaged it.
Basically it's the "real brexit hasn't been tried yet" kind of rhetoric.