Again, there is little dispute over the fact that adding the missing genders would cost a fair amount of time and money to implement. The issue is with taking that already qualified ("probably") statement from the Fanfest and then trying to apply it to the missing genders, when they later gave a reply on the very topic stating they would consider their addition based on the resource cost and obviously the demand.

Had they considered them to be the same, they could have just referred to their prior statement at the Fanfest, rather than giving the answer they did in the letter. One obvious reason as to why they did not do that is because they may have objections to adding a new race over and above the missing genders which go beyond resource cost.

Either way, it's a moot point. They have given the answer they've given, so the statement at the Fanfest is irrelevant.