So you can say Yucatan is Mexico, the same way Ubuntu is Linux. Or the same way people say Windows, instead of Microsoft Windows NT.
OP is technically correct, but that’s not how people express themselves in real life, there’s an unspoken understanding in the community that when someone says Linux (when talking in a general sense), there’s no way they are referring to the kernel only.
Hahaha, too stable and boring… Do you use OSs as a form of entertainment? No wonder why people can’t take Linux enthusiasts seriously.