Earlier quoted context omitted.
https://stockshed.com/products/t3542-zig-2-4-ghz-wireless-me... I think ZigBee uses Zig. It's an implementation.
The page you've linked is very confusing, but as far as I can tell that's a Zigbee device that the manufacturer (Tensor plc) consistently describes as a "Zig" device. I have no idea why, it's bizarre. - This thesis [1] identifies a product in this family as a Zigbee device. It's on the 80th page (numbered 62). Elsewhere it's referred to as a Zig device. - I can't find anyone else claiming to make Zig devices or any r…
The point is made, though: You can see how people think Zig is a protocol and Zigbee is a (certainly the primary) vendor. Whether that's true or not!