There are only four rules in the linked article and three of them don’t apply to Blumenthal’s recipe:
- chicken is not cooked below 130F
- not using immersion circulator so its temperature calibration is of no concern
- not cooking in plastic
This leaves #3: pasteurization. The chicken is left to rest for 45 minutes once it reaches internal temperature of 60 degrees C. Should be enough time to satisfy the 30 minutes recommended.