Well the math they did was 0.5/0.3 = 1.(6)

To make the logic for that math easier to follow, imagine it was actually 60% of teenage girls rather than the 50% from the article.
If you pick a random man, there is a 30% chance they consult AI. If you pick a random girl, that chance is instead 60%. So twice as likely, or expressed a different way, 100% more likely than when picking a random man.

Switching back to the 30/50 numbers you get that a random teenage girl is (at least) 66% more likely to turn to AI than a random man.
To me, this seems like a reasonable way to compare these numbers and it makes it clear that the difference is actually pretty significant, contrary to OP comment's claim.