EMP grenades - how acquire recipe?

So… what had happened to emp nades around 9999? Were they deemed too OP? There is no recipe now, except all I’ve got is the recipe for “emp bomb” which have some esoteric component I’m not even sure is IN the game. It definitely doesn’t have its own recipe.
The funny thing is, hub 01 still sells them, at least in one hub of 2 I have found so far.

Someone Did mention you can buy them.