I re-read the article. Oppo didn't meet THX certification. As such, Lexicon shouldn't have either.
"An ideal THX certified product should exhibit a -3dB rolloff at 80Hz with a 12dB/octave slope for the High Pass Filter (HPF) and a -6dB rolloff at 80Hz with a 24dB/octave slope on the Low Pass Filter (LPF). As you can see, neither the Oppo NOR the Lexicon players meet this requirement and they actually measure identically to each other. The slight tabulated variance is a function of cursor interpretation error on the graphs combined with measurement variances caused by component tolerances. Based on our findings we can unofficially (but in practicality) state that the Oppo BDP-83 is (or might as well be) THX certified despite the bass management doesn't meet their 80Hz 12 dB/octave HPF and 24dB/octave LPF requirements."