The linked article has this:
That 39% figure claimed by the U.S. is widely disputed with the World Trade Organization saying the EU’s average tariff rate was 4.9% in 2024.
...
“Nevertheless, considering the actual trade in goods between the EU and U.S., in practice the average tariff rate on both sides is approximately 1%. In 2023, the U.S. collected approximately 7 billion euros [$6.35 billion] of tariffs on EU exports, and the EU collected approximately 3 billion euros on U.S. exports,” the Commission said.
That's an excellent question. Pretty sure the page I copied that quote from looks a lot like the linked page. I don't have other pages about this topic in my browsing history. Either CNCB edited the page, or my browser forgot a page.