The MG42 had a suppression radius of 10 until the very last patch, now the maxim (suppression wise) will be the MG42 before the latest patch. So yes it will do AoE suppression now. The maxim technically always did AoE suppression, it just did extremely little now it will do AoE suppression like all the other machine guns in the game do.
The nearby multiplier is what gives machine guns AoE suppression, that and suppression radius.
Just to clear any possible confusion
nearby suppression multiplier is the % of suppression that gets passed onto nearby squads. How far of an area that supression is passed on is not this value but
nearby suppresion radius.
The nearby suppression multiplier changed to 0.8 so it will actually suppress blobs of infantry within its nearby suppression radius better. The nearby suppression radius hasnt changed from 10 so its area of suppression coverage still remains the same. The MG42 has a nearby suppression radius of 13.