The system is still “PC” in this case, even if technically the platform is different. And since you have to log into your account with their service, they can easily confirm that you own the game.

I don’t have to create an account to play Slay the Spire on Android.

its share value has still risen 27% over the last 12 months

I’d expect performance under the 5600X3D, which at https://browser.geekbench.com/processor-benchmarks got a score of 2085. For reference:

• 9950X3D: 3410
• 9800X3D: 3344
• 9900X3D: 3339
• 7950X3D: 2928
• 7800X3D: 2725
• 5950X: 2211
• 5700X: 2147
• 5800X3D: 2117
• 5700X3D: 1924

Note that these results are aggregated from people with this hardware running Geekbench on their own machines and the rest of their hardware and config (including, for example, cooling, overclocking) isn’t controlled for, and as such is very likely to be different, which would impact results.