No Errata
Q: Can I use the Last Lunge reaction even if my fighter doesn’t have an Attack action with a Range characteristic high enough for them to target their attacker?
A: Yes. If you do so you will not be able to resolve the Attack action (but you will still have used that reaction opportunity).
Q: If my fighter is taken out of action by a ploy and I use Last Lunge, can I choose any target for my fighter’s Attack action?
A: Yes (as long as they are within range and line of sight).