Pretty much sounds like a root kit, but worse since it’s embedded in firmware simply wiping and reloading won’t fix it.
Read for comprehension, for-q-clinton. Nowhere in these articles does it say that ALL Macs are infected. It merely says that the CIA can, with physical access to a targeted Mac, compromise it. That has ALWAYS been the case with ANY computer. Hell they found hidden spy chips in Sharyl Attkisson's Apple keyboard AND hidden Steganographic files containing classified government documents that some three letter government agency had planted in her Home iMac, as well as running a spurious fiber optic cable line into her house to spy on her, just because she was writing articles critical of Obama!
The same kind of chips were secreted inside her CBS owned Windows PC laptop, so it isn't Apple centric spying. . . That was at least two years ago.
Re-Flashing the firmware takes less than ten minutes. Apple can push out a correct firmware for the computer and have the owner do it if necessary.