The US vice-president wrote the "only response is righteous anger" when referring to Henry Nowak's death on X.
Paul Quinn is jailed over the 2003 attack in Salford for which Andrew Malkinson served 17 years.
Snow, the lead presenter of C4 News for 32 years, will be seen navigating his diagnosis in a new film.
The boys' sentencing last month caused an outcry when they were given youth rehabilitation orders (YROs).
The British actor, who also appeared in Merlin and Little Britain, died of complications from pneumonia.