I meant that the belt doesn't seem loose when pulling it with the fingers, although, I know, that isn't by far a great fault evaluating way haha, and on the visible pulleys it's running straight... Meanwhile, I received a video from the mechanic when he was almost done with the job. Here it is:
Video
I know there's not much to figure out from here but when he turns the phone's camera you can clearly hear the ticking louder so it would've been logical for me atleast to check exactly where it's coming from with all that available space in there and with the covers off... Anyways, I am trying to find a couple of hours of spare time to get this done by myself, will come back here and hopefully will be able to identify the culprit until then, in the meanwhile I am waiting for my flush material to arrive, would I need yo fit a new filter right before doing the flush or is it ok to do the flush with the only drained of oil old filter? And then fit the new one after the flush of course.