Be interesting, do cool things and invite someone in to join you. Thats damn solid advice.
People often think their hobbies are boring or to niche and think that no one will care about them. But passion is infectious and by sharing things you think are interesting you will eventually find someone who wants to share it with you.
Taking dating advice from a divorce attorney seems like taking swimming lessons from a shark. Maybe he has good points but I can't help but wonder about his intentions...
At the same time though, he sees where people have routinely fucked up. He sees exactly what critical incompatibilities get missed until it leads to a divorce.
I'd say it's more like an ER doctor teaching people how to use a chainsaw. They may not necissarily know what to do, but the sure as hell know what not to do.