There are 24 seats in a 1A coach. This train has one 1A coach. But only 18 seats appear at max when bookings open.
Remaining 6 are held up for Higher Official Quota to be released to passengers recommended by the official railway staff or in case a high-profile person like a member of the Parliament and the like is traveling. At chart preparation, unused HO quota is used to clear the wait-list and if a few seats still remain, some passengers from a lower class (2A or 3A) are upgraded to 1A.
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So I assume there'll be at least one person who'd be cancelling his ticket in the next two months or if not so, at least one of the HO will remain unused. But yes at the end of the day, it's just a PREDICTION.