Basically says “we have a single stack magazine that transitions to a double stack, which allows the chamber area, slide width, and the area around the trigger guard width to conform to single stack standards, but the double stack portion allows for double stack capacity.”
It’s also more complicated than that. At face value, it’s not the first single stack/double stack hybrid, but the patent also goes into greater depth.
https://patents.justia.com/patent/20190195584
https://patents.justia.com/patent/D858680