The BB descriptions aren't accurate. You need to ask them directly.
My S20+ said it was a CDMA which is/was Verizon. I knew Verizon went to GSM. The store phone salespeople didn't know that Verizon switched. I googled it for them and showed it, they were very surprised.
Verizon changed over to GSM around the first to stay with the world. They still use CDMA if your phone has HD voice. Some older Verizon phones don't have HD voice.
You can google "Did Verizon switch to GSM."