OP – have you asked him about it?
As you say, you are kind of mates – so take the uncertainty out of it.
I wouldn’t employ a known Neo- nazi, or a tub thumping anti semitic blinker lefty, if I was working one on one with them.
The issue is probably not the known ones, but the un-known ones. From his posting he is far from being “closet”.
Back in the mid noughties, they did a poll in Austria where 60% of people said they had fascist sympathies.
Hofer nearly was elected with 49.3% of the vote. Then there was Joerg Haider in the ’90s.
Would that stop you buying anything Austrian?