I believe they played with the semantics here to perhaps get a pass on it not counting as an exact violation of wp.org repository guidelines. There's a proposal to have strict policies and disallow any sort of global ads now but it seems dismissed [1].

It was a dismissable admin notice that looked like an ad and wasn't exactly a tracking link (in the wp.org classifications at least), but a generic marketing campaign link [2].

[1] https://github.com/WordPress/wporg-plugin-guidelines/pull/69... [2] https://github.com/Yoast/wordpress-seo/blob/12.6.1/admin/cla...