Wouldn't that increase mean arterial pressure? Would the heart reduce its output as a response to the external pressure? And what's with their claims of it clearing "trash" from your brain?
I honestly have no idea. The marketing material suggests old people show health improvements. I'm no expert but so far it seems officially it doesn't do anything but looks promising.
This is a pretty cool technology.
https://billionsinchange.in/en/solutions/renew/
It squeezes the legs to help the heart pump blood.