If you still had any doubts that the inplay is bogus

[Celtic]

Well my observetions are quite different. Any changes you make do not affect the game at all. What happens is that teams quite often perfom differently on each half of the game even if you don't make any change. ex. You score 5 goals on first half and then, without any changes, you score only one or no goals on second or the other way around. This is quite easy to observe if you play a lot of friendlies against the same team.

EXACTLY!!!

There's this team I befriended and that I often beat by circa 9-0.

Look at this lol...

Sometimes my team scores 6 goals in the first 25 minutes!!! then 3 in the rest of the game.
Sometimes they score 5 in the first 80 minutes then 4 in the remaining 10 even if I make one substitution every minute just to prevent the team from playing, they'll score between substitutions like they are desperately trying to reach 9-0, lol, scoring goals while running to the bench.