NCB: not accurate. On YK there are things that are inserted into the chazarat hashatz. Plus not all Sephardim follow the same approach of hefsek as other Sephardim. There are many, many examples. The “Sephardic” community that most Americans (especially in NYC) are exposed to are Syrians. But there are other communities who have different Minhagim.
And not every Sephardic community (perhaps none) follow the SA 100%. Some follow Kabbalah and some rule in certain cases like, gasp, the Rama.