Good to know. My players have been pulling a quick one on me. Haha. [Unless there's some feat going on.].
... The rule states you only lose the wounded condition if someone heals you with Treat Wounds which you cannot do in combat. Even Battle Medicine specifically states that it does not remove the wounded condition even if uses the same Treat Wounds DCs to heal in battle. This makes getting knocked out in battle very deadly.
If someone drops to 0 HP, they're still Wounded no matter what unless they take 10 minutes and fully heal or get Treat Wounds.
It's still going to be really hard to kill a PF2 character with how quick healing can happen and the repositioning of the character's initiative (so basically we everyone gets a full turn to try to save them).