Perhaps you felt that Md's explanation shifted the blame for USB delays, but that certainly ins't how I interpreted the original statement. However, if one just read your carefully snipped version and not the original, then of course one would (incorrectly) think MD were trying to shift blame. The reader then forms either 2 opinions:
1. MD are trying to shift blame to Simtec and cover their own asses.
2. The statement as quoted by yourselves is true (ie Simtec are responsible for continuing delays over USB).
Neither of these statements is true, or what MicroDigital actually said by any stretch of the imagination.