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It was obvious from reading Theo's post that he was wrong about the availability of the Genesi hardware. I am not sure when Theo posted the message, but I assumed that it was before a significant number of board were produced. My guess is that Theo assumed that Genesi was a scam company rather than just a bad company. However, what led him to this opinion: the credible claim that a developer contracted to work for Genesi was unpaid.
Regarding the retractions, I only found one regarding some false reports of sabotage. However, it only retracted those specific claims and was sure to include "This is by no means an absolvement of any other issues." Genesi does not have to engage in sabotage to be considered untrustworthy: simply not paying their employees is enough. As far as I know, that specific claim has not been retracted by at least two people from two different projects.
Not every claim has to be true. For a company with zero street cred to screw even one person over is a clear indication that something is very wrong.