The Mikohn safechip readers only work from about 6 inches. Chips have to be placed on the 'spot' directly above the reader. Ive tested it. A pile of 28 chips is the max that can be read.

These chips do not have unique ID's. If the casino reader could pick up from a greater distance it would be counting every chip in the casino for every bet If the Wynn report is accurate in other ways, then they are NOT using the chips/technology they described.