One of the options for Nystul's magic aura is:
Mask. You change the way the target appears to spells and magical effects that detect creature types, such as a paladin's Divine Sense or the trigger of a symbol spell. You choose a creature type and other spells and magical effects treat the target as if it were a creature of that type or of that alignment.
This all seems to make sense except the part at the very end about alignment. You only choose a creature type, not an alignment, when you use this option of the spell. In fact, this is the only mention of alignment anywhere in the spell's description, so the fact that it says "that alignment" as if referring to a previously mentioned alignment makes it seem like this could be a part of the text from an earlier revision that was accidentally left in after all other mentions of alignment were expunged.
So, is nystul's magic aura actually intended to allow masking of alignments as well as creature types? If so, how does that work? Do you choose an alignment as well as a creature type, or do certain creature types automatically imply certain alignments (e.g. devils and angels)? If not, is this an error in the spell's text?