No, what happened was that the UN made much noise about a famine in Gaza without actually declaring a famine. This went on from the beginning of the war in October (before Israeli ground operations began) until about April or maybe May. Then, an investigation was conducted, found no famine, and declared how important it is to prevent famine.
It wasn't "noise", it was perfectly legitimate concern about the intentional deprivation of food and other essential supplies by the occupying forces.
Per the precious words of their so-called Defense Minister:
“I have ordered a complete siege on the Gaza Strip. There will be no electricity, no food, no fuel, everything is closed,” Gallant says following an assessment at the IDF Southern Command in Beersheba.
“We are fighting human animals and we are acting accordingly,” he adds.
And of their National Security Minister, Itamar Ben-Gvir:
As long as Hamas does not release the hostages in its hands - the only thing that needs to enter Gaza are hundreds of tons of explosives from the Air Force, not an ounce of humanitarian aid.
Whether the situation ultimately met the technical definition of "famine" or not by the time Biden successfully twisted Netanyahu's arm to compel the establishment some form of humanitarian aid to flow into the territory -- is basically a matter of splitting hairs.
