I would imagine that the close friends/family of the Avengers are familiar with what actually took place however, the public only knows that some blip occurred which restored 5 years.
Having said that - I would imagine they'd think that the Avengers went back in time because how else from a regular standpoint would you reason a 'blip' bringing people back ...
I've got two proposals which are probably very intertwined:
Maguna is a town in India, North of Ahmedabad (North-West India): In Spiderman: Homecoming Tony Stark rescues Spiderman from the bottom of a lake. Later, they talk to each other and Spiderman at some point realizes that Stark isn't in the suit. Instead he's remotely controlling it from some place ...
Unknown but probably not
The only real indication of what the public knows is from Spider-Man: Far from Home from the school video
Over five years ago, half of all life in the universe, including our own
Midtown High...was wiped from existence.
Then eight months ago, a band of brave heroes brought us back.
So clearly the Avengers seem to have revealed some ...