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it seems you didn't understand this phrase:
Al Feyn
the rating is calculated based on confirmed reports, and they are often confirmed much later than they were written.
This leads to the fact that someone's rating changes based on a state that may be half a year ago, and from that moment on, the rating of everyone is recalculated.
someone confirmed an old report today - from that moment on, the personal rating histories of the two participants in this game have changed.
Then, everyone they played with after that.
Everyone who played with those they played with, and so on and so forth.
If a very old report is confirmed, it will affect almost everyone.
The rating history that the image was based on no longer exists; what ctrl f?