How does salt concentration affect chromatin compaction?
I think the 'whereas' part is excessive and misleading - I'd say "Higher concentration results to more condensed state".
So charge of DNA + solution will be the same but it will be distributed differently:

$$ D^{-} + nK^{+} + nA^{-} \rightarrow (D^{-}+mK^{+}) + (n-m)K^{+} +nA^{-} $$