Dikwena conceded on either side of half-time as they saw their hopes of advancing to the knockout stages disappear before their eyes at the Stade 5 Juillet 1962 in Algiers.
Stars will host Swallows in their final group encounter at the Royal Bafokeng Stadium next weekend, before bowing out of their maiden Confederation Cup campaign.
Platinum Stars: Chibwe, Mpeta, Mlilo, Mwedihanga, Mnguni, Mere, Baloyi, Senne, Ng'ambi, Mabena, Ntuli.