"Just use some polynomial" would be an idea so generic that it wouldn't merit attribution. "Just use a cyclotomic polynomial of degree 24" is a lot more concrete.
(I have no idea where the exact limit lies and I have no idea how precise or vague were the ideas in those discussions.)
Hashing out a problem is a complicated thing. From the point of the AI, or another person, even a negative suggestion ("I tried computing those Jacobians and they showed nothing of value") can be very helpful in steering you away from non-productive paths, but we rarely attribute such negative suggestions in print, we may not even remember them.
All in all I think that OpenAI should have mentioned using material from those people, but I would also like to know what material and to what extent.