I don’t yet have an official response on the flange manufacturing tolerances and dimensional accuracy, but I’m told some of our public drawings and CAD models may be inaccurate by design, to help prevent copying and underselling using our design work.
If that’s the case here then presumably it’s at least accurate for the interfacing aspects (e.g. mounting hole sizes and locations), but may be approximate for the other dimensions.
It’s been pointed out to me that this has been responded to previously 