Premium Tatkal is denoted as PT.
Few trains have this "Premium Tatkal" quota which also opens a day before the date of the journey along with Tatkal.
This premium tatkal quota has dynamic faring system which means fare will keep on increasing with decreasing vacant seats.
When these PT quota seats are left vacant, then the Tatkal waiting passengers are allocated those seats. But...
more... when these seats are exhausted/booked then chances of TQWL to get confirm is next to impossible.
That is why we mentioned a lot about it in your case.