That’s not true.

https://www.rtbf.be/article/cuisine-la-frite-vient-elle-de-f...

https://www.news.uliege.be/cms/c_10630394/fr/les-grands-myth...

Also the French have the great Antoine-Augustin Parmentier, early and famous potato proponent. Do they even want credit for such a basic dish?

There is considerable argument over it.

Yup, French fries are Belgian. Also - it's important to cook them twice, otherwise it's just McDonalds and not real French fries.