Ed Parker did not say that EVERY ONE Mitose's techniques were without merit. There are many basic techniques that are common to MOST systems. It is not surprising that books from competing styles would include some similar techniques.
Ed was most critical of techniques that left the defender exposed or that limited the retaliatory response. The response of those students present when Mitose presented his demonstration was most telling. They recognized the limitations of Mitose's techniques. Ed Parker didn't have to saw a word to them.