It's a fair review of a classic 70's speaker. For those that look down their nose at the Bose (see what I did there), HiFi is about what makes you happy, and since speakers in particular are very personal in terms of expectations, 901s had (I believe) 4 iterations and every one sold well. So they did something right.
Heck, I still have fond memories of a pair of Sansui speakers (LM 330's?) I bought in high school along with a Marantz 2235B receiver.