How effective is the ProxyGambit at allowing access to the internet without revealing true location and IP?

I’m very interested in purchasing or manufacturing this device on my own and maybe using it in conjunction with Tails/Tor:

https://samy.pl/proxygambit/

According to the site:

ProxyGambit is a simple anonymization device that allows you to access
the Internet from anywhere in the world without revealing your true
location or IP, fracturing your traffic from the Internet/IP through
either a long distance radio link or a reverse tunneled GSM bridge
that ultimately drops back onto the Internet and exits through a
wireless network you’re no where near.

While a point to point link is possible, the reverse GSM bridge allows
you to proxy from thousands of miles away with nothing other than a
computer and Internet with no direct link back to your originating
machine.

A high speed (150Mbps+) link is available with direct line of sight
from 10km+ away, or if further away, a 2G GSM connection produces a
reverse TCP tunnel serializing a shell into the device accessible from
anywhere in the world via the Internet or GSM. Either method proxies
your connection through local wifi networks near the device, shielding
and making it more difficult to determine your true location, IP and
identity.

Unfortunately, it doesn’t appear to be sold anywhere online and it hasn’t been discussed online since 2015.

My apologies for asking so many questions, but there appears to be no info on the actual workings of this anonymizing device, apart from a few stories in the media. For all those with some technical aptitude:

Has this device been extensively field-tested? Have there been any recent technological developments that have improved on the device? Does the device do what it says it does? And how would this compare to a directional long-distance wifi antenna to bypass need for an ISP and conceal physical device location? Would it be more or less secure or anonymous?