It looks like INT's are not being counted as being thrown at in stats.
https://usflwfl.myfootballnow.com/team/20

CB Hampton has 1 thrown at, 0 Kck Dn, 1 catch allowed, 100.0 All'd %, and 1 INT.
Would've never seen this if he didn't happen to have an INT with 1 thrown at.