Will an unlocked Galaxy S20+ SM-G985FD Dual-SIM work on XM?

This is the Latin American version.  B&H has a good deal on them this month and I'm wondering if it will work.  They list it as TMo and ATT compatible, but my old Galaxy S8+ was an ATT device and it worked fine on XM.  I have to admit, I don't understand how GSM phones are able to work at all on XM, given that iit runs on Verizon's newtork.  Maybe someone could enlighten me.