They didn't just include the “I had to get a replacement unit” as a part of a bigger review where they ultimately did what normal consumers do and have the manufacturer replace the unit. Kudos to AirGradient for not trying to pamper their reviewer with a hand-vetted unit like everyone else. But it backfired. The reviewer isn’t a normal consumer who cares enough to return their unit for a working one. That’s the point. You’re not getting an authentic experience because the reviewer just gave up because there wasn’t time/budget to do the fair review.