You might lose more weight temporarily- but all the weight you lose will be water weight- not actual fat. Go into the sauna to relax after a hard workout- not to try and lose more weight! Relaxing will probably help more in the long run anyway since stress is not helpful for weight loss.

The sauna helps to detoxify your system as well as sweating bUt try to do the sauna thing after your workout in moderation cause it can also cause you to dehydrate, so of course drink tons of water, everyday regardless of what you do

Sauna is there to loosen your muscles to keep you less sore from working out. It will temporarily make you loose weight but it dehydrates you so you must rehydrate before you work out again or you will have pain on your joints. You need fluid between your joints to absorb shock. Best plan is cardio but if you match it with light weight training the muscles you build will burn fat when you are at rest.

only if you keep the calories down, u can eat but choose wisely

no. all u lose there is water. your weight on scales maybe less, but as soon as u drink a glass of water all will be back

You shouldn't want to lose "weight", you should want to lose fat.
And you don't do that by sweating, it's just water weight, and if you lose too much of that, you can die, on the spot.
Sure, exercise a lot, but drink a lot of water it will help flush the fat from your body.

Well if you go to the sauna afterwards and do lose weight it will only be water that you are losing which is temporary and that weight will come back as soon as you drink something.