So what's your point? You are taking the word of a disgruntled mod about a situation that is almost 3 years old without any further proof other than their claim. To your question though, Bungie has the and uses the right to remove a player from their game for any reason that breaks their TOS, CoC, or general decency. If what you said/did was found to be egregious enough and Bungie was informed, you most definitely could earn a ban. Your only action was to file an appeal to have Bungie verify the ban was placed correctly, and being well over their normal turn around time of a couple weeks, they feel your ban is correct. Bungie almost NEVER gives a reason for a ban, that does not mean they are not valid, just that they dont want to engage with letting you know why.