Chess.com's rating prediction makes no sense

What about it?

For context, this was a 700-rated person I just played against in a 5-minute blitz game. How was the rating so high? Link: https://www.chess.com/live/game/81484144170

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Hardest 2000 ELO puzzle I’ve ever gotten

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Is this a red brilliant?

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Why is this a mistake?

What about it?

White to play, capitalize on blacks mistake and secure a crushing advantage.

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Black M3 I missed from one of my blitz games.

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Flagged with mate in 1 on the board 🥲 I'm furious

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Why is this brilliant?

What about it?

I’m just defending the pawn for a pawn push. I don’t see why that’s hard to find. As I’m writing this post I realized that I left my knight hanging 💀 I guess the pawn push is a bigger threat than the knight on the board.

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black to move (what to move in this situation ) i lost the match after making a bad move , e4

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First blitz game

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Shouldn't my king be able to take the knight if the pawn is pinned to the king

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Double whammy!

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