In your Medusa Halo link it's stated that it's a "384-bit LPDDR6 or a 256-bit LPDDR5X" chip. An Apple Ultra chip is a 1024-bit chip. So they are not comparable: In the worst case the Ultra has a 1024-bit/256-bit = 4 times higher memory bandwidth.
The M7 Ultra could introduce the biggest unified memory upgrade in Apple Silicon history, according to Bloomberg's Mark Gurman. It is substantial enough to put Apple's flagship SoC closer to workstation and entry-level server-class offerings.
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