As a reader of his column I could guess a few things:
-he got tired of waiting on M for high resolution multichannel playback/streaming,
his main interest.
-he became convinced there are better ponies for movie multichannel.
-he believed Meridian was in no hurry to or cared strategically to chase them down
-he found exciting room correction alternatives.
-he never had DSPs anyway.

James
NC1: 861v8, ID41, 218, 251(to outdoors), DSP8000SEUG, 7200SEC, DSP520 rears, Apple TV, DirecTV, Oppo BD103, QNAP251, Roon
NC2-M7005, Triad Silver Speakers,Acurus Amps

FL1: 861v4, ID40, 218, MS200, DSP8000SEs, DSP7200SEC, DSP5000s, DirecTv, AppleTv, OppoBD103, QNAP469, Roon
FL2: Marantz 7005, 251, M60s,60C,33s, Oppo BDP-93,MS200, Roon