Because the constitution already says:
Regardless of the Rank listed next to his name, he retains all the rights and privileges associated with all his ranks.
The trouble of course being that Civitate isnt a rank, while Citizen is. A reference to a civitate being eligible for something therefore makes no sense whatsoever.
However, if we assume the curia wouldnt vote to pass a decision which makes no sense whatsoever then we have to assume that Civitate (as in the badge) is intended by virtue of the decision to be a meaningful distinction in some way.
My argument is that this distinction is not intended and needs to be amended in the text of the decision, making this amendment unnecessary.