Interesting. Thanks for sharing. But a counter hypothesis I have is that this might be from the wild population over time getting more interbreeding with escaped domestic cats, causing the apparently domestic behavior in the wild ones.
I think it should be easy to rule out with genetic research and it probably was ruled out since the research shows that domestic cats come from this wild species not yhe other way around, though they interbreed in areas where they have opportunity.
Seems like there's some controversy here, with some research saying that the wildcat is endangered from interbreeding with feral domestics and others saying that its too late.