I don't think people are actually grasping what happened here lol. It's not like you can just go unlock literally any S10 by throwing a screen protector on it. Most of them already have a screen protector on them, so why can't you go unlock them?
You can't tell me that someone JUST figured out that if you walk to up any of the 30 S10s you see in a day with screen protectors and pick it up, you can unlock it. That's just not what happened here. Something was read by the phone when setting up the fingerprints that persisted after this screen protector was applied, so all touches looked like the fingerprint. It's not like it's an issue that's impacting every S10 out there.
edit - actually just reread again. So this woman bought an S10 (says it's hers), and put a screen protector on it. Then used her finger and her husbands finger to unlock the phone that hadn't been protected by a finger print yet. These phones aren't locked by fingerprints until you scan your fingerprint. Pressing your finger on the screen doesn't even attempt to unlock it if it's not locked by a fingerprint. Sounds like she was just "unlocking" an unlocked phone. Right? There's nothing to unlock if you haven't locked it yet lol