Enzo,
Your other thread stated that the physical work of your job is overwhelming you and you plan to ask for accommodations to rest more. Given that stated issue, adding an elevation mask to any exercise you're trying to do on top of your job seems like a potential misplacement of your energy.
I recommend that your first goal be achieving milestones (that you set and continue to push on) of exercise/work duration and intensity. Then if someday you feel that your intense exercise is no longer a challenge, maybe consider this tool.
However, you should discuss this with your clinic before buying/trying. I suspect the mask cannot be sanitized and could grow plenty of bacteria and fungus that would be dangerous to a person with compromised lung defense (scarring...as per your other threads).