Well, RX 580 is Polaris, unknown whether these are still 14nm GPU chips, or if they've transitioned the RX 570 and RX 580 to 12nm, as was introduced with the RX 590. The 570 and 580, were slightly process-tweaked (allegedly) and factory-overclocked (allegedly), versions of the RX 470 and RX 480.
So, they're sort-of a re-badge, but they've been clocked higher, and given 8-pin (in most cases) power connectors (some, like the Sapphire Nitro+ RX 580 have an 8-pin AND a 6-pin, for OC'ing, and extra cooling).
They're not as power-efficient an architecture as NVidia's GTX 1650 and GTX 1660 (vanilla / Super / Ti), but they can hold their own as far as performance benchmarks. They are primarily a 1080P card, not a 1440P card. (For Gaming purposes. They will do 4K UHD Desktop usage.)
Edit: For the same money, an 8GB RX 580 card ($150) is way better than a GTX 1650 (vanilla / D6 / Super), in basically everything but power-consumption. If you have an OEM PC without a 6+2-pin power connector, then you had best stick to the GTX 1650 family.
Edit: Plus, this deal is NO REBATE, that's got to be worth something too.