Actually, in the foreword of the House Davion sourcebook, the writer says the following:
So it's highly probable there are actual descendants of Stefan Amaris around, children born from his concubines.
What's funny is that they (the steel vipers) thought there was just one descendant. How does that make sense at all?
Your asking Clanners, who engage in blood libel, to make sense? Remember, in the canon, a Steel Viper
Khan is out hunting anyone tangentially related to the Wolverines, including family lines that didn't migrate with Kerensky.
Yesterday you didn't know what 'Clans' were, this morning you're being murdered because the second cousin of one of your ancestors was part of the not-named clan over 200 years ago.
D'ya really think people who'll do that, wouldn't do the same over anyone faintly maybe-related-kinda to Stephan Amaris??
That's the best guess so far, especially considering the recent conquest...
It's not MY version of Kowloon, it's Drakensis' version, there are going to be differences, including his being a Kowloon that would actually survive as a habitable place after being conquered rather than needing the Clan version of 'Exterminatus' before they'll surrender.