Yes. Their law doesn't allow elections when martial law is in effect and it also states that the current president will hold office as long as the successor has been chosen. Plus, if I'm not mistaken, it was Ukrainian parliament (or whatever they're called) who decided to not run elections, not Zelensky himself.

Also that 4% approval is complete bullshit, as the article states. If something Zelensky has a bit higher approval than before.