I came here to second this. The author clearly has experience only with Goenka and has absorbed their atypical use of the Pali word "vipassana". It's not usually used as a noun to describe a retreat. Nor was it "lost" for centuries. Most serious Theravadan retreat centers have been doing plenty of vipassana.

IMS is a wonderful facility. On the west coast, its sister center is Spirit Rock, though they're not quite as well set up for long retreats.