“PC” historically refers to devices that are “IBM PC” compatible, although nowadays that mostly means machines with x86 chips… except that powerful ARM desktops, laptops, and servers are becoming a thing too so that’s not accurate either. Plus there’s that whole “Mac vs PC” ad which also makes the term more confusing.

But even going by the recent historical usage, I’d say the Steam Deck qualifies since it has an x86 chip, whereas the PS3 has a weird custom PowerPC cpu (which, ironically, was made by IBM).