R5 3550H & R5 3500U have the same CPU ID on AMD website : YM3500C4T4MFG TDP 35W & 15W
And my RX 560X shows RX560. RX560X is OEM series. Clock speed is higher then RX560 mobile. Radeon"T" is bug form my NB BIOS. https://imgur.com/a/HCFfIP3
Well, this is strange and might be some fake or sort of 'patch/rename' by BIOS.
CPUID says "AMD Ryzen 5 3550H with Radeon Vega Mobile Gfx ", but this name can be changed by BIOS or applications.
HWiNFO is not fooled by this and instead reads the CPU name from internal fixed registers, which says: "AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx "
Thus I believe what HWiNFO is showing is correct.
It's possible that ASUS (or AMD) renamed the CPU for some (marketing) reason.
Also the fact that both 3550H and 3500U use the same OPN (YM3500C4T4MFG) indicates it's the same CPU.
Internally it's a 3500U.