At Nikon, DX stands for APS-C. For full format, Nikon uses FX.
digitec has combined the format designations of the different manufacturers here, which can be irritating.
The Canon EOS 80D is an APS-C camera.
The next or cheapest full-frame camera from Canon is the
Canon EOS 6D Mark II Body, 3-year premium warranty (26.20MP, 6.50FPS, GPS, WLAN).
However, with an EOS 80D you can use lenses designed for full-frame cameras (EF lenses).