Security checkpoints don't combine identifying information with the order you go through security. If you had to scan your boarding pass before entering the scanner, that would be different, but... you don't.

So, unless they are using face recognition to scan you when you get your boarding pass checked then re-compare it at the rapiscan, there's no PII gathering happening.

(Now, they could always make a policy change and say "now you must tag your boarding pass on the scanner before entering" but we're not there yet.)