This question is basically an extension of this question, in which it's mentioned that a devil fruit user can't use Haki because he/she gets weak due to seastone, but seastone shouldn't have any affect on Non-Devil fruit user. So can they use Haki while they are in contact of seastone? Like Zoro and Ussop did during Water 7 arc.
https://onepiece.fandom.com/wiki/Silvers_Rayleigh is a good example! In his introduction, he does something like that already.
In the latest Wano arc, we see Luffy does something like Rayleigh(breaks seastone cuffs)
I agree to the point that https://anime.stackexchange.com/a/53266/53844, overtime people can build stamina to resist seastone cuffs and also seastone cuffs effect might vary unlike sea