Yeah, you used to have the option to use IPX/SPX but that was strictly for LANs and was just not scalable for Internet use. AppleTalk is also another network protocol. TCP/IP has basically completely phased both of them completely out.
Anyone who uses any kind of modern computer network, including the Internet, "uses" TCP/IP. I think the deal was that the hiring manager wants candidates to be familiar with TCP/IP in the sense that they understand the concepts of IP address, subnet mask/subnets, gateway, DNS, common service ports, maybe even how TCP/IP works at a core level (the various headers). But of course the idiot HR person has no idea.
By the way, it sounds like I'll get an interview out of this one.