Correct, as they aren’t actually rules, they’re general precedents. There is no defined time allotments in the rules.
And I think there is enough evidence to show this is intentional. Nearly every other major Sport uses a stop clock to reduce—as much as is possible—wasted time (either intentional or not).
But football persists with an elapsed clock and largely arbitrary added time keeping system, which allows for all manner of manipulation.
This is not a bug, it is a feature, in the same way the handball rules have been written so nearly any decision can be explained away, no matter how inconsistent.
It is protected opportunity to attempt to influence match outcomes when possible.
That poster will say Arsenal could have gotten three penalties at the end. But none of them could be given because that would be far too obvious (they were all clear dives). So extra time was added on (and more time yet added on to it) in the hopes Arsenal could snatch a winner.
It’s not even a strategy that is nonsensical. Of course the league would want Arsenal to win it this season. They want any of the other top six clubs apart from us to win it. They want a new champion and a new rivalry. Our dominance has had its benefits but prolonged dominance at this point is becoming detrimental to their long term mission.
Call it a conspiracy theory if you want, but there is plentiful evidence of this intention and concern throughout their own statements, as well as very dubious officiating throughout this season.