Go5G Plus Military gets a FULL $900 TIV and I don't have to switch??

Just making sure I've got this right, as it's never seemed to be this way in the past for myself or my wife. I'm still awaiting iPad Mini OLED details to decide if I want to go the Duo route, but my wife isn't that tech savvy (but does like an updated device), and her 15 Pro likely needs to get upgraded. I'm seeing on the megathread that Go5G Plus Mil is offering $900 towards the 18 Pro, and appears I can still keep my current line, no strings attached?