I can personally vouch for that but probably only on QP.
Had a Moira tailing me as i moved towards the 2nd CP on Volskaya, with just her (Moira) and a Genji, we kinda bum rushed the Red Team and my Rein did not die as i wrecked havoc. Other 3 blue team came up from Spawn and we got the win. iirc, everything took under 5 minutes and it was only 1 push.
Insane healing numbers.