It doesn't seem correct to you because they might have been trying to be sarcastic. Using two sensors would admit that they might disagree, and that there might be situations where the MCAS could not work. But there cannot be a situation where the MACS doesn't work if the MAX shall have the same type rating as previous 737s, so the sensors cannot disagree, and so it would be useless and wasteful to use two sensors. Issuing that disagreement warning would completely undermine the very reason for the existence of the MCAS.