twrp name for sm-t719 is gts28velte ; neither the 10 inch version (gts210velte aka. sm-t819) nor this one are supported.
the wifi versions gts28vewifi (sm-t713) and gts210vewifi (sm-t813) are very similar to their lte versions, with exceptions of lte, battery, and screen ppi.
my mom just got an sm-t719 stuck on august nougat patch, so I started looking (she lives in a different country and is not very technical, experimenting with roms remotely just to keep her stuff safe is not very practical), but if I was there I'd start by loading twrp and using it to back everything up, and then trying the gts28vewifi of lineage. (as staoddo suggested above).