I am curious where had you found the rules that users will be ban posting threads out of the local board? I noticed multiple threads have been created by mdayonliner previously in other languages sections. And mdayonliner has discussed into meta about his threads there. Although I can't recall the threads but as far as I remember he was inspired to do so and no one prevents him to create a thread as long as it's helpful for the forum. Still, I found a couple of threads (locked & unlocked) exist that were created by mdayonliner in Bangla. Since his account hasn't been banned, I don't think your account will ban for contribution since your intention isn't spamming there.

But again, since it's an account ban question, just make sure with forum moderators. It doesn't matter what we think, moderators will follow their moderation policy. So just wait for a moderator reply.