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* "Game that ran in a 486 @ 66 MHz (for the same fps), with 4 MB RAM in 1993 running on a 80 MHz Cortex M33, with 0.108 MB RAM"

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tbf they ported a low RAM version, specifically the GBA version, not the original one.

So the OP is not entirely wrong: they ported a game played on a 16.8Mhz system with 256kb of RAM to a 80Mhz with 108Kb of RAM.

The writeup explicitly says «we could trade off some computing power of the 80Mhz Cortex M33 to save memory»

Still the original Doom features are all there, except multiplayer. They also restored some missing graphics features of the GBA port, like z-depth lighting. Yes 4MB vs 108kB is more impressive than 256k vs 108k, but cutting in half the memory requirements is still notewhorty.

So a port of a port isn't a port?

At a quarter the resolution.

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