Exactly!
People could be "covertly recorded at the gym" (as the article states!) by other pre-existing recording devices (any other kind of video camera, mounted in the gym or on a gym member's smartphone or other electronic device) -- not just Meta's smart glasses!
In other words, the central issue of the article seems to stem more from consent (more specifically, the lack of consent!) than it does from a specific type of video recording device...