I saw these and I thought they were so cute, like I genuinely wanted one for myself because it looked like something out of Subnautica. Then I go to the website and lo- it's made for fucking landlords.
They even have a calculator that calculates rent for the pods.
They'll never regulate this shit, you'll have an absolute
putting like 10 in a house and charging every head full rent.
He was right 
Capsule hotels are real and have been for a very long time. Can't comment on this website, but tiny little pre-fab pods just big enough to shove a bed in, sometimes with tvs or whatever, stacked on racks to cram in as many as possible, have existed in Japan at least for decades. Characters living out of a capsule hotel is a common theme in cyberpunk.