If you have to ask this question, then you don't deserve to have a 4/55 5* AA lol.
Kidding aside, to answer your question, only an awakened AA will have his neurotoxins do damage and reduce ability accuracies like regen, evasion and so forth. An unawakened AA will have the neurotoxins strictly deal damage only.
Even unduped poison reduces healing though. His sig will stop it entirely and does have a lot of value but stacking more poisons (not neurotoxins or bleeds) will reduce the amount of health the opponent can gain back. If I remember correctly I think all poison stacks reduce healing by about 35% or something like that. Same applies for any character that can inflict poison.
I'd invest in the Despair mastery if I were you - each debuff will reduce healing by 5-15%; plus poison reduces 35%. You can massively reduce healing with Archangel, as he stacks so many debuffs.
Unfortunately it's never really clear how the percentages multiply up/add up/override each other; because Kabam's grasp of statistical exposition is like a Toddler trying to explain Proust.
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Kidding aside, to answer your question, only an awakened AA will have his neurotoxins do damage and reduce ability accuracies like regen, evasion and so forth. An unawakened AA will have the neurotoxins strictly deal damage only.
Unfortunately it's never really clear how the percentages multiply up/add up/override each other; because Kabam's grasp of statistical exposition is like a Toddler trying to explain Proust.