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I'm surprised it happened at all to be honest. At my last place, not only did we have dummy bbs to double check the threading before the frame was brazed, but the BB shell was chased with taps when the frame was finished. So any threading issues would be apparent before the customer received the bike.
But in any case, I'm not defending Isen. Just that without showing proof, anybody can just say anything on the internet.
It’s all pissing in the wind now but whether or not there’s a grove to denote thread direction, no builder - least of all one who has experience of their supplier incorrectly marking shells - should be putting a shell in a frame without checking the threads.
I don’t think it even comes under lack of quality control, it’s more like, contempt for your client or some shit.