The official blog post just talks about third party cookies: https://blog.google/products/chrome/update-testing-privacy-s...

I think the main reason Bloomberg is calling them ad cookies is because it is the impact on advertising that's causing this delay. Google promised regulators that they wouldn't get rid of cookies without a replacement for advertising, and those replacements aren't ready yet. On the other hand, this is really hard and I don't know if Google is actually going to be able to do this ever.

(I used to work on this)