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Doing anything too complex there would be pretty surprising to me. if they are it seems they didn't do too good a job since the test is emulating a old phone that should probably get a simple/smaller page

There's a CSS media detection feature called `prefers-reduced-data` that may be graduating from a Chrome feature flag Soon™, although I'm not sure if Google is using that anywhere on their sites today.

https://bugs.chromium.org/p/chromium/issues/detail?id=105118...

They absolutely do serve legacy versions to old browses. I'm pretty sure you can still get a version with the black bar on the top.