I am one of the moderators for the BronyCon discord. I looked into your request and found that you were banned from the discord not because of your dispute with another mod/admin but because of other remarks entirely from making threats to the well being of others. Also you were banned on November 7th 2018 which is no where near the 2 plus years that you claim. As it stands the ban will not be removed and any attempt to rejoin the discord server otherwise will result in those accounts being banned as well.
I thank you for your desire to be apart of the BronyCon discord server and wish you all the best on your future endeavors.