New signing Bradley Ralani scored the only goal of the first stanza midway through before Rushine De Reuck, Pavol Safranko and Peter Shalulile put the game to bed in the second stanza.
Mngqithi insists they are not fazed by their congested fixture schedule, as they know what's expected of them.
"But at least we're saying minus one now, it was difficult when it was a lot. Now we're saying 27 minus, so we have 26, maybe in the next nine days we have another three matches," he told SuperSport TV.
"So we understand what we're in for. We have already played 30 matches by the way, maybe 31 with this one in three months, so the next three months we're expected to play the next 26 if we were to go to all finals. So we're ready for that and we know what's expected of us.
The Sundowns co-coach also gave his verdict on Ralani's debut for the club and how he's able to slot in with ease.
"We know what he [Ralani] can offer, we told people what he's capable of, the quality that he has is unmatched sometimes, technically very good, makes very few mistakes tactically and understands the game very well," he added.
"He fits into our style of play because the position that he plays for us is the same position that 'Mshishi' [Themba Zwane] plays, it's the same position as [Thabiso] Kutumela plays, it's the same position that Neo [Maema] plays.
"And Cape Town City are not playing away from us a lot. They are playing almost the same style of football that we do and he understands what we expect from him.
"I still believe today he could have scored two if he took an extra touch on the chance that he took over the bar but we're happy he smashed the second one, which gave him a little bit more confidence, maybe trust from the supporters and everyone around him.
"Because we believed in him. I must also commend all the coaches for believing in what we're trying to do because credit must go to coach Rhulani [Mokoena] because we were in the Compact [Cup], Steve [Komphela] had to go home because he was bereaved.
"And he [Mokoena] remained behind, trained the team alone and worked with this group, he really did a good work, we must commend his work."