If the calories burned are greater than those I can consume to maintain my body weight (currently about 3000kcal/day) then yes it will make me lose weight.
Also yes it is cardio, or it wouldn't be good exercise. It's not HIIT or running, but it consumes energy and calories.
Do you fundamentally misunderstand the concept of calories in versus calories out? If my body needs more calories than I'm eating it will harvest muscle to do so. I've been lifting weights for over a decade and diet is just as big of a factor in gaining muscle versus lifting itself, this isn't something new to me.
Wait until you learn about British colonialism.