As far as I can tell, the RX 5500 doesn’t get Ultra profile (it gets High I believe), which alone makes that PC spectacularly expensive for Zwift. Hard to say what the frame rate would be like these days. It’s a weird/wasteful build though, with the 5600G having good integrated graphics (not for Zwift) but with a dedicated card in there too. It’s also full of proprietary crap which deliberately intends to make it difficult to upgrade or service.
Hard to recommend, sorry.