I read that his receipt tells him to do 90 days report on Nov 20th, which is the same date his current visa extension runs out. So if he goes their on Nov 18 for another extension, he can also do the 90 days report as it's within 15 days prior to the next report date (20th). Although I find it odd that their 90 days report date is due on 20.11.2021 if they just did the report yesterday because technically, it should have been 90 days after like you have said. But if the receipt says they should report on Nov 20th, then they can do the next report earlier as long as it's within 15 days prior due date.
Yes, you can do your 90 day report on the same day you do your next extension. 90 day report can be done 15 days prior to or 7 days after the mentioned report date
It would be much appreciated if they do it that way so those who are extending their stay in CW does not have to travel to MTT. Thanks for the info. I'll do that next time as I am heading to MTT now.