This very much depends on how you define a "PC". It's certainly not declared by performance and inside Consoles it's PC technology working anyway. Maybe the modular aspect of modern PCs? In this case a C64 can't seriously be called a PC.
for reference:
This definition explains the meaning of Personal Computer and why it matters.
www.techopedia.com
Another interesting read on the topic:
PC and console gamers have been at for it decades, but which device really reigns supreme? Learn all the differences between PCs and consoles.
learn.g2.com
which suggests that PC owners have generally spent much more money on their gaming rigs than console owners. So if someone really feels the need to determine which camp deserves to be considered first, the answer should be obvious.