that is correct however the democrats were terrified and spread the fear that trump and the republicans were going to stack the court. when they used that term is was used as an expletive with the notion that stacking the court meant loading the bench with partisans.
biden (the party really because biden wouldnt know what room he is in) has now come out and said he would do what he accused trump of wanting to do (falsely).
so biden looks like he will stack the court which means adding seats and yes you are right there is no limit.
the same with congress. there is no limit as to how many representatives can be elected (house not senate)
