Yes, because it would need every single one of the Tier 1s to buy a ticket for there to be none available to Tier 2s.
I expect this will be game where the fewest tickets go to Tier 2 though.
All of Tiers 1 and 2 have had the chance to snap up just 2,000 Swansea tickets and some still remain as I type.
That won't be the case for Manchester United's 3,000 tickets.
If you're in the first tier you are always guaranteed a ticket as long as you buy before tier 2s get a chance, so something like 8:00am the next day or whenever the new queue forms.
(They mean Wednesday 18th October, not Saturday)
"The on-sale dates are as follows, and those season-ticket holders entitled to make a purchase on 17th October are guaranteed a season, providing they book before 9am on Saturday 18th October."
A season of what?