> there was this idea of using Aiqus as the discussion forum platform for all the courses

Not sure if you're referring to the current bunch of courses or the first three (AI/ML/DB). I'm assuming it's the latter. Aiqus was only used for the AI class. IIRC it was set up independently but someone before the course began and ended up being the pseudo-official Q&A forum (linked to from the main site).