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so last editon it was 1 or more units with netters -1 S
but
netters:
Your opponent must subtract 1 from any hit rolls made in the combat phase for any of his models that are within 2" of a Night Goblin with a Barbed Net.

does this stack now?
its not any Night Goblin with a Barbed Net
its says a Night Goblin with a Barbed Net

Doesn't stack - it's a binary condition checked on the attacker. A model either is within 2" of a Netter or it's not. If it is, it gets -1 to hit.

To stack, it would need to be phrased along the lines of "Netters give all models within 2" a -1 To Hit penalty"- that one's checked on a Netter by Netter basis.