Louis-Frederic, you just opened my eyes about sous vide. I didn't even think about trying it in this device.
I tried the vegetable risotto. The taste was great! I set 120C, 10 minutes. I guess, the device needs some time to gain pressure and temperature, then it releases steam 4 minutes before the end of the program. So these 10 minutes were perfect for carnaroli rice. The only problem I face with all my risottos is that after adding cheese it gets too sticky. I'm ok with it, but after few master classes there is a prejudice in my head that risotto must be creamy like a porridge, it doesn't hold its shape.
As for MC vegetable risotto, I followed the recipe very precisely, found aged Gouda cheese. Maybe it just needs a little more liquid?