GDPR specifies a different interpretation of events, that takes precedence here: the user chose to visit GDPR-bound site A, and the law requires site A not to compel the user to visit any site B that is not bound by law or treaty to honor GDPR as well.

You’re not wrong that one could logically evolve your interpretation from circumstances, but GDPR’s authors chose not to accept your interpretation as sufficient, and went further than that.