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):

1. 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.