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I've heard of people doing this before, removing their fingerprints with a sander..

But I believe the fingerprints will grow back after a while. Couldn't you get into more trouble if they grow back and you are carrying around a passport with no fingerprints in it? Or do you plan to keep sanding them off for the rest of your life? (or the life of the passport)

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As the author claimed there are many reasons you may not have had fingerprints. Personally, I would try the tried and trusted 'shrug, I have no idea' method.

They do grow back. Just destroy the chip, then there is no way to read them out again.

Now you have two problems..

Why? Does a chip that cannot be read render your passport invalid?

Only if there's evidence that you destroyed the chip on purpose.

A strong EMP might destroy it without visual clue.

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