I’ve met people like that guy too. I don’t find them particularly smooth. Bold face liars, yes, smooth, no.
I’ve also known women that fall for schmucks like that guy in the video. Everybody knew he was a schmuck and a liar. I suspect she really did too, but she was accept virtual any halfassed lie as a rationale for his behavior. She wanted to believe.
I’ve also know confidence men like Madoff, literally sitting in Fed prison now having swindled millions. Not really smooth either. Again, pretty bold face liar. He played their greed and somewhat ignorance. But I’ve seen some of the promises and the BS meter went right off.
The common thread is they want to believe. The liars aren’t particularly good.