This app is a reskinned Groove Music, it was mostly written back in the early Windows 10 days (2014-2017) and long predates Copilot/etc. Even the Windows 11 rebrand as Media Player (2022?) predates that stuff, and it's barely been touched since then.
OP was clearly a joke about Copilot making bad code
it's a reasonable-sounding inference (if your only context is that there's a "new" Media Player and it's taking more memory) that doesn't apply in this particular case.
A joke can be "funny because it's true"