My first thoughts on the matter is that there is no (published) proof that:
a. the guy was a voyeur, the body could have been left as it was to promote that idea; or
b. that the guy was murdered by nudists, the body could have been left where it was to promote that idea.
The whole thing could be what it seems to be or it could be scene setting to set the police on a false trail. After all, the media will get to talk about nudity so that should keep them chattering for weeks on end.
My second thoughts are rather darker. Maybe the guy was more than a voyeur. A lot of little girls and young women from Ukraine get caught up in the sex industry by guys who kidnap, drug and transport them to market as slaves. Maybe the dead guy was a procurer caught in the act.
Of course those are just two possible scenarios, the list is virtually endless.
Has anyone else here seen the movie "Citizen X"