Can FL board change rules to limit guests?

The declaration of our condo association states units are for sole use of owner, family and friends without further stipulation or exceptions.

Last year, without discussion or a vote, the board changed this to one friend, who must have been known by the owner for 2 years, and can stay for a max of 2 weeks during a 12 month period!

Can they legally do this? We have a meeting coming up, and I want to challenge so need to be armed with as much info as possible.