It seems like they sent out a message at one point explaining that a pocked shop was a shop with a shortened report that involved very little narrative. I think its a term that they just came up with to make the shopper feel like less work is involved since there is zero shopper pay. If their shops are considered "pocket" shops, then TXR shops are the teeny tiny pocket that are on the side of bluejeans.
They put it on a standard dining shop here. You know, the kind where you have to photograph all the food and beverages before bites/sips, take exact timings for everything, explain all "no" answers as well as writing LOTS of narrative about the things that were correct so they can tell you knew to look... I believe it's just another way of promoting shops as "quick and easy!" and it is absolutely meaningless.