It rather looks like there are FPGA/ASIC that can mine both x16r and x16rv2 ... And after the fork they just switch FPGA/ASIC to x16rv2.
Looks like? So no longer a fact then... Cool. Maybe you should go educate yourself on what it takes to make an ASIC before you talk out your ass. By the way. An ASIC is a chip. You also have to design all the other hardware around it including the circuit board etc.
The ONLY way there could be ASICs currently mining the coin, is if they're happy with the estimated 3.5% they can still mine, or they were so brilliant they could look into the future and lay out the circuitry to be able to take into account how the new algorithm works AND that Tiger would be added in. Would love to see the probability that someone could have done that cause I simply can't see it and I used to design hardware etc.
What "could" happen is that they use some method where you can create ASICs from FPGAs. But you still have to design the board and all the other circuitry around it, prototype and test, and then manufacturer it. All of that takes quite a bit of time.
If the change had no effect on the ASICS and FPGAs, then I would LOVE to hear how you explain the big drop in hash rate and why others are mining a classic version now.