Iran’s nuclear program was one of the most transparent in the world thanks to the nuclear deal with Obama, which Trump left. With the war, it’s difficult to know what Iran is doing as far as nuclear research and building.
The war may have strengthened the Iranian regime by giving Iran an outside enemy that is attacking them. When Trump talks about erasing civilization and shares maps of Iran breaking up, that facilitates Iranians believing that the US and Israel are after Iran, not just the current regime.