move

My partner and I play an opening bid of 2H as Flannery in the first two seats only. I opened a weak 2H in third seat, which partner explained incorrectly as Flannery. Partner raised me to 4H, passed out, and I informed our opponents of our actual agreement at the end of the auction. During the play, I discover that LHO has the stiff heart king and an opening hand. If 2H was explained correctly, I have the inference that he cannot have five spades, as he would have overcalled 2S with such a hand. However, since LHO thought 2H was flannery, he may have failed to act with five, or even six, spades. Question: Is it authorized information that my LHO thought 2H was flannery during the bidding? Correspondingly, am I forced to take the inference that LHO cannot have 5 spades and play accordingly (that might potentially lead to a spade ruff if LHO does indeed have 5 spades)?