My opinion is that this applies to GA4 as well.

The decisions don't explicitly mention a version, they say these particular sites: "...shall cease to use the version of the Google Analytics tool used on 14 August 2020". They don't say if that's UA or GA4. The original complaints from NOYB refer to UA, but the issues cited in this decision would apply to GA4 as well.

So when the DPA says "Companies must stop using Google Analytics", there's no reason to think they only mean the version that was already shut off when they published that post.