You need to prove otherwise.
Like many said, no one so far, Top Tier or not who had a DF showed signs of being able to use Haki while handcuffed by seastones.
And claiming Luffy couldn't because his haki isn't up there when he literally used CoC when he was knocked by Kaido is a disingenuous remark.
And that was still supressed handcuffs, so they could still work on the prison.