We
do call current intel CPU x86.
As so many things, the organization we now call EU has changed over time. Pretending it formed ex nihilo in 1993 is at least as silly as ignoring what came before.
Reality is messy and drawing hard lines can easily discard a lot of nuance. But if I have to, I would place the foundation of the EU in the post-war era, not at the Maastricht Treaty