A moderator closed a recent question as off-topic. A few users disputed the close, believing it to be based on a misunderstanding of the question. (The moderator's comment before closing said to look up big-endian vs. little-endian, which has nothing to do with the question.) The mod reopened and reclosed the question, wiping the reopen votes. The mod also deleted his initial comment and the comments disputing the close.
Is this a valid use of mod powers? In a case like this, is the moderator supposed to have the final say on whether the question stays closed? The fact that we can vote against a mod close vote suggests that those votes are supposed to count, but the fact that the mod can override them suggests maybe not.