I think you are right, the speculation that X10 and -B products are FPGA is not true. One can see the thread about overclocking Baikal units somewhere at this forum to find the proof.

I have built Lbry and Myriad-Groestl  algos inside of 28 nm FPGA. These allgos are hot - about 80 C and power hungry - near 40 W. The hashrate was about 200 MH/s in both cases. Unfortunately some month after that -B had been released and these two bitstreams became history.

But one thing Baikal have not done yet to bury altcoin even lower by their units. [And GPU miners should pray..]

As for Baikal-N I would not be so sure. The cryptonight is definetly feaseble in FPGA. Personally I am too lazy to implement it, because other altcoins are much easier to implement.If the hashrate will go down after the fork, it would be reasonable to build Monero in FPGA anyway.

Also the price of FPGA may become quite low in mass quantities, and even lower when using refurbished parts.