We had a simular run-in with the poster on the JOLT boards after the Mods left. When politely asked to delete his trollish spam from the Thread by TG, he responded with a (paraphrased) "No, and the Mods can't make me". I cannot remember if I kept the Telegram but the post was surgically removed by reporting it to the JOLT staff.
Not sure if this matters other than showing a possible past history and an unwillingness to cooperate.
EDIT: The TG is still in my box if it is needed.