Thx for the article, but I can't see how you come to the conclusion you draw based on it. It does no clarify the opt-in/opt-out stance at all. In contrast ( https://searchengineland.com/report-google-asks-publishers-t...) states

"Use of personal data cannot be based on implicit or opt-out consent. There must be “a statement or a clear affirmative action” indicating a willingness to share the information. Google will reportedly be capturing that consent for properties that it controls, such as Google.com and YouTube. But the company is asking third-party publishers to collect consent in situations where Google’s technology and ad targeting are behind the scenes (see below). "

Which to me as a layman reads you need to have users opt-in to consenting to be used in Google Analytics if it is used in your product/site.