This has nothing to do with Gruber fans or not. Your take just isn't as smart as you thought it is. Highly regarded newspapers, tv programs or books have updates / retractions all the time as even with the best fact checking it's possible that something slips through.

How is this Gruber's fault? What level of verification do you expect of a tech blog discussing the experience of another tech blogger?

This is a very strange take. We got a full-throated retraction. Error correction is a hallmark of trustworthiness.