I didn't mean to sound too derisive, heritability is an actually useful metric as far as I can tell, it's just not as intuitive or monosemantic as a lot people will make it out to be, especially in the absence of significant correlating DNA evidence.
Siskind strawmans this into the alleged opposition desperately claiming that "it's not genetic unless there's a specific gene you can point to", aka the bitches dont know bout my poly/omnigenic traits argument.
It's both, probably. Sounds like the Alice and Bob of compsci security parable fame, except pretentious, and Mallory is the writer.