My concern with this is they said nothing about the exchange of air or heat in this space. Such a small space would get very warm pretty quickly and with it not touching anything it would retain the heat. The air would also not exchange unless you manually did it making it eventually suffocate you.
They said you could bring things in so I suppose you could bring the air with you.
After a quick googling it looks like the average person breathes 20-30 cubic meters of air a day.
But a server wouldn’t care about oxygen in the air just the heat.