Well, there’s someone who doesn’t understand the flight planning rules and regs of ICAO. When you request a level change at a Reporting Point that, according to ICAO, is the position that a level change is to commence. Therefore, you are still in the cruise at F310 until you get to MAKOT, when you are then requesting to BEGIN your descent to F090. I wonder who is doing your flight planning; that is a BASIC rule. UpperATC is absolutely correct in stating that if you begin you descent at an earlier stage, then the descent profile will correctly calculate your access into Z818.
So, before “slagging off” IFPS, have a word with your Ops people first. This incorrect filing of an FPL by inserting the level change at an incorrect point has been going on for 25 years; when will filers learn?