The author, Stuart, dismisses the entire study based on: expectancy bias, and participants being able to tell whether they are in the treatment group or the control group.
What if this were applied to everything? "95% of participants preferred the meal of pizza to the one that was hard tack and water. However, participants might have just had pre-existing bias that pizza was tasty, and they were able to identify whether they were eating pizza. No conclusions can be drawn whether pizza is actually tasty or this is simply a placebo effect caused by the participants' expectations."
What if this were applied to everything? "95% of participants preferred the meal of pizza to the one that was hard tack and water. However, participants might have just had pre-existing bias that pizza was tasty, and they were able to identify whether they were eating pizza. No conclusions can be drawn whether pizza is actually tasty or this is simply a placebo effect caused by the participants' expectations."