83-4 only refers to the parliament. 157-2 says exactly that.
Article 19 Section 1 of Ukraine's Martial Law legislation reads (translated to English from Ukranian with Google translate):
- In the conditions of martial law, the following are prohibited:
changing the Constitution of Ukraine ;
amendment of the Constitution of the Autonomous Republic of Crimea ;
conducting elections of the President of Ukraine, as well as elections to the Verkhovna Rada of Ukraine, the Verkhovna Rada of the Autonomous Republic of Crimea and local self-government bodies;
conducting all-Ukrainian and local referenda;
conducting strikes, mass meetings and actions.