Website blocked URL:Blacklist

The website ritschel-keller[de] is blocked by avast reporting: URL:Blacklist.

I’ve ran the site through pretty much every malware checker around (virustotal[com] etc.), checked google transparency report and ran a malware scan plugin.
Nothing reports anything that warrants a block by avast.

I’ve reported this false positive here but haven’t got any feedback/answer regarding this after around 1 week:

avast[com]/report-false-positive

Is there anybody else I can report this to or speak directly to?

First, I’m an Avast user and not an Avast Team member.
You won’t get a direct response but it should be analysed within 48 hours, if found to be false it will be removed.

You can also report it via the More Options in the Avast Alert window.