They say they autopopulate fields based on field type, but address fields are common to have an autocomplete feature enabled. That would require transmitting data before submitting the form. I didn't see anything about rating probabilities of the transmitted data being benign and useful or nefarious and malicious.
IIRC, this is what caused those huge payouts on the biometrics from Facebook and Google who didn't pay proper attention to per-state laws.
I'm assuming they are only tracking obvious third-party data escapes here (e.g. page includes off-domain JavaScript) rather than the less-obvious route here where the first-party receives the data and then shuffles it off to an outside party on the back-end.