That is "NOT" excess of SALT.  

That is state tax paid in 2019 FOR 2018 - usually the 4th estimate for 2018 paid in Jan 2019, or the amount owed for the 2018 return paid in April 2019.

It has absolutely nothing to do with the $ 10,000 SALT limitation.  IF the amounts match, it's one of those odd coincidences that occasionally happen.