[nwombosi]

  Unlike printers, every typewriter had its own individual typing pattern which made it possible to link every document to a particular machine, Izvestiya said.

I thought printouts could also be traced back to individual printers? Leaks didn't start with printers. Just ask people who leaked during the Cold War and even long before then. Leaks go as far back as when text was used for communicating confidential information. Going back to typewriters isn't going to put an end to leaks, especially when leaks having occurring since long before the digital age.

[pampa]

It is not about leaks. It is about backdoors in hardware.

[drdaeman]

According to various news sources, they're buying Triumph-Adler Twen 180 and Olympia Comfort typewriters. Don't know about the former, but the latter seems to be a full-fledged computer, even having an option of a disk drive.

Certainly, the architecture must be ranges of magnitude simpler, compared to modern desktop computers, but still you won't know what's really implemented inside the CPU die disassembling the device and reverse-engineering all significant chips using scanning electron microscope.