You should have known Roger was a fraud based off the Oden flashback alone. Ran from BM, Stormed when Shiki pulled up, clashed with Fruitless WB, Went on his knees and begged WB which lead to his PK title.
This mural just gives way for people to finally accept that Roger was never an unattainable lvl for the mid gen. Benefit of the doubt? Sure, but with context we know better than to say Roger vs the strongest of the current gen is anything short of an extreme diff.