I think it's more like if you owned a blogspot site, and you're gdpr'ing the list of users who visited your site (given Google logged every single user who visited, and associated that visit specifically with you).

Linkedin is recording every person who visits your profile and keeps that in your user records, and they are already selling it back to you. The argument is that you have a right to that data.

Linkedin is arguing that this data needs to be protected for the privacy of those visiting your profile and the argument is that if they really believed that, they wouldn't sell it back to you, compromising that privacy anyway.