You understand the post was not intended to be strictly literally interpreted, right? Use of silly manufactured words such as "unobtainium" is a reasonable clue such a comment is made in jest. 
It's an oddball size given the rarity of it's usage, and how commonly torx sets skip from T10 to T8.
I will credit you this, that is the first time I've seen that set. I have, as yet, never had a reason to seek out a T9, or any torx smaller than t8.
It's an oddball size given the rarity of it's usage, and how commonly torx sets skip from T10 to T8.
I will credit you this, that is the first time I've seen that set. I have, as yet, never had a reason to seek out a T9, or any torx smaller than t8.

I have been reaching for that more often than the ratchet now. 90º to break loose or tighten then 180° to spin it off/on like a screw driver.