Learn from your mistakes does not find blunder for white on move 10. It says "No mistakes found for white".
Where is the game?
He probably means this one:
White could have won the Queen with 10 Rxa7, but White is 620 centipawn material up, so that 10 dxe5 wins just as well. So 10 dxe5 is a "blunder" in the sense of 570 centipawn loss, but not a "mistake" in the sense of changing the outcome of the game: White wins anyway. I agree with the way it is handled. It makes sense.
#4 Probably it's like tpr says. White will win anyway. Handling it in another way might lead to silly situations I guess if there are many moves that obviously will win but only the "best" is considered correct.
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