Poor fact check ...
" ...how they were able to modify a Sun Microsystems SPARC microprocessor to effectively create a hardwired backdoor .."
The compromised CPU was the LEON3 SPARC processor from Gaisler Research, not a SUN CPU. The conference paper is here if somebody actually wants to read it ...
https://db.usenix.org/events/leet08/tech/full_papers/king/king.pdf