You're linking to a fake website made by the private company behind Proton Mail, that tries to present itself as an official EU site. What they claim will be in their own financial interest, and not what the GDPR law says.
From the horses mouth:
"GDPR.EU is a website operated by Proton Technologies AG, which is co-funded by Project REP-791727-1 of the Horizon 2020 Framework Programme of the European Union. This is not an official EU Commission or Government resource. The europa.eu webpage concerning GDPR can be found here. Nothing found in this portal constitutes legal advice."
From the horses mouth:
"GDPR.EU is a website operated by Proton Technologies AG, which is co-funded by Project REP-791727-1 of the Horizon 2020 Framework Programme of the European Union. This is not an official EU Commission or Government resource. The europa.eu webpage concerning GDPR can be found here. Nothing found in this portal constitutes legal advice."