Yes, the actual exotic bounties from year 1 are no longer available. But as Potato says below, you can still get the weapons from legacy engrams from Xur.

You can get the bounty weapons through leagacy engrams using xur. He gives y1 versions of a gun. Let's say i'm missing SGA. I have to GRIND FOR 31 strange coins, then wait for xur to sell Heavy legacy weapon Engram, then hope it decrypts to a SGA and not another heavy i already have like g-horn