Bug with "Game Rating" in Game Review

My opponent played a terrible opening, quickly losing 2 pawns, and then resigned at move 16. But the game review gave him a game rating of 2400!

Here is a link to the game review:
https://www.chess.com/analysis/game/live/123103876715?tab=review

This seems like a bug with Game Review and it would be great if it could be fixed to be more accurate.

At maximum it's 2350 but the algorithm uses both player's ratings and associated accuracies to generate the values. Since it gives you a 2500, the opponent estimate seems to be in line with the algorithm.

It should not take into account the players rating, only the moves played. His opening play seems at most 1600 to me, so it does seem like a bug.

Is there a document or web page that outlines the algorithm?

It's really hard, maybe impossible, to take a game and give an accurate rating estimate based just on move accuracies that will work with all games qualities across all ratings and rating differences between players.

Opening knowledge does not necessarily equate to rating either

No, that is not public information.

I'm sorry, that's totally incorrect. It's 100% possible to give an accurate rating estimate for how someone played in a game without knowing their rating.

What is your background in this? How are you qualified to answer these questions? Your answers seem like they are from someone with no specific knowledge, just opinions.

Do you know of a site, or program, where one can do this accurately? It would be great if there were such a resource available as I would like to examine my game performance over time to see if there's any signs of improvement! Hmmm, perhaps it's better not to know? ha

Please give an example where it's 100% accurate. I'm not aware of any.