is this a reformed temple?

Yes. Temple Sinai of Palm Beach in Delray Beach Florida is a Reform congregation. Note the word is "Reform", and not "reformed". Just like for Christianity, there are many types, for the Jewish religion there are many types. The 3 main are Reform, Conservative and Orthodox. The difference between Reform and Conservative is the type of services and the rituals. Some say Reform services are church like in there is a choir, musical instruments and everyone says and sings the prayers together. While in Conservative during the service, some people may be doing 1 prayer and others another. Orthodox is very strict in the separation of men and women during the service. Orthodox and Conservative follow the kosher eating habits while in Reform that is optional. There are more difference but this is a good start.

A reformed temple is a congregation that practices principal above ritual

Yes