I was going by memory. The Wikipedia page on him gives a rundown but doesn’t mention much about affiliations with neo-nazis.

https://en.m.wikipedia.org/wiki/Klaus-Dieter_Flick

The last part of this article does. I guess it would be safer to call them unconfirmed allegations but fuck him

https://www.thetimes.com/article/collector-kept-weapons-and-busts-of-hitler-in-nazi-bunker-vzfc5gzzr

The backstory is that it was a rich guy whose house was a Hitler shrine and was in bed with neo nazis