I'm surprised this dude got clowned so much for this.
All he said was, "if a woman is interested she'll find a way to get your attention," which is literally what all those red pill/manosphere dudes have been saying for years when they say, "Wait for choosing signals."
Plus he can't be older than 22-23, which means he's gone through his formative years during the #MeToo era, where woman have (understandably and rightfully so in a lot of cases) been screaming from the heaventops, "Leave us alone we don't want to talk to you," for over a decade now. So it makes sense he wouldn't want to approach a woman without some sort of indicator of interest.
He's literally following the advice of both men and women, but both men and women are clowning him for following their advice.
The only issue is how adept these guys really are at picking up on these 'choosing signals.'