The article says they recovered the black boxes in the Ethiopia crash. Also, Boeing has been ordered to improve the anti-stalling software. I'd look also at the angle of attack probes to make sure they are sending correct AOA information to the computer systems because of GIGO (Garbage In, Garbage Out).
On the F-4 (I know, showing my age) it was common that a dirty angle of attack probe would give faulty information to the CADC (Central Air Data Computer), which in turn would send faulty information to the altimeters and you'd get some wild altitude readings. I know the auto-pilot system had an altitude-hold mode but probably this new anti-stall system goes way beyond that. Also, pilots were not allowed to use the altitude-hold feature below 10,000 feet, probably because of these problems.