This is so objectively untrue that when I read it I assumed it was a joke or somehow tongue in cheek.
Even at the height of its popularity, the OP-1 was rarely used by serious, professional producers ... for reasons that should be pretty obvious. It's a toy. When I say "used" I mean "found its way onto the final version of a track," and when I say "professional" I mean "someone who works in a studio or who produces music for a living." I owned one and enjoyed it, and by TE's frequent appearance on the front page, I'd say many here did as well.
The title of the link is also a stretch. I disagree, but I think it skates by. The Microkorg had a huge impact on music tech, but was also rarely used in the studio or on tracks (in part because of its bigger brother, the MS-2000).
EDIT: The title has been edited. I don't remember the one prior, but something like "...massively influenced music technology."