This you must ask to those who follow you for privacy or to your lawyer.
Although I find it very difficult the survey has disappeared from LimeSurvey replaced by: "We are sorry but this survey is currently not available - please come back later." LimeSurvey confirms that it has banned the user: " I am sorry for the inconvenience. This customer has abused our survey service for sending out this email. The customer is blocked permanently . "
As stated, the sending email is noreply@limesurvey.org and of the noreply type, so no one reads any replies, and it is not the activist's email. The link to the survey / forum even if it uses its domain, redirects to limesurvey.org. Sending a request to the Italian Guarantor through their PEC to protocol@pec.gpdp.it asking for clarification costs you nothing. Now that you know how to read your Google Analytics Client ID it doesn't even cost you anything to ask https://www.limesurvey.org/ to remove you from their Google Analytics stats. The support email is: support@limesurvey.org.
Surely it is an excellent Marketing activity now thousands of ecommerce owners and websites know the services offered by limesurvey.org, as well as the activities of this activist.
Not bad. You can both publish and quote his Activist Email, as it is public and sponsored by the activist himself on social media.
The above is purely the point of view on a technical level, for the legal question I refer to the excellent article by the LegalBlink Team:
https://legalblink.it/post/federico-leva-google-analytics.html