Having worked at a company with a collective agreement in Sweden, nothing within it restricted my salary or my ability to negotiate as an individual. Upon coming into effect, the agreement simply gave me more vacation days and set a minimum yearly raise to keep up with inflation (one that was always surpassed and enhanced further with individual performance bonuses etc).

I "saw" that link. It says nothing about your claims at all. Here's my counterpoint: https://www.disney.com