It really does matter who made the call claiming eventually to be RF2. If it was genuinely a fire response vehicle, they only have visual externally, with no real knowledge of fumes within the aircraft. Therefore not qualified to venture an opinion.
If the calls came from the company, same situation, but probably increased liability in court as a result.
There are ways to positively determine the exact origin of the calls and the identity of the caller, so someone should be quite concerned with their own skin. Knowledgeable readers should not discuss the means of doing this for obvious reasons.