fpga for x13 maybe be possible already but i doubt?
also asic for scrypt-n is another fake one, with no proof
anyway there are still other algo like hefty1/nist/jha ecc...
Be it x13, or x99 FPGA is always possible, but as the no. of algos increase, ASICs become more difficulty to make.
FPGA/GPU will require more memory with this coins, otherwise there's no reason why they shouldn't be able to mine them.
Quark/Prime algo on the other hand require decision making so they perform much slower on FPGA/GPU.
Momentum algo just uses high amount of memory to prevent FPGA and GPU; which's counter productive actually, and such a thing does not require skills. But for the same reason it's ASIC friendly, cause ASIC can have a large amount of cheap specialized memory and it's cores can be designed just for the algo.
Scrypt-n is nothing different from Scrypt, so their claims are realistic.