As timmaaa already mentioned, the title/topic of this thread is clearly about unlocking the bootloader, not
about unlocking the SIM (which is what you link is for). Two completely different things. They just happen to share the word "unlock", which in itself means nothing.
Plus, your link is not even for the One X, its for the One X+. Completely different hardware.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)