That's a total misquote. I saw him say this on the livestream. And somebody wherever you got that from, cut some bits out of his quote there and rearranged it in the wrong order.

When he was on stage, he said something like "last year, I said here that WordPress ran 7% of the internet. This year, it is up to 15%, and 22% of all new domains in the US." In that case, he was referring to WordPress as a whole, both .com and .org.