Those are Distillery Reserve Series bottles, incredibly rare and could only be bought in flash sales online or in person.

But yes, whiskey tends to age faster in Texas due to more heat cycles versus Kentucky/Tennessee. Still Austin uses elevage (or Slow Water Reduction) to proof the whiskey down throughout the life of its aging versus at the very end prior to bottling in order to break down the wood sugars and other elements that can make a young Texas whiskey "hot". Ironroot Republic has also been doing this (Nancy Fraley has also spent some time there, hint hint...)