Say what? Your gedanken simply proves that you've assumed that gravity is attractive when time reverses.

If you place a ball on an inclined plane then it rolls downwards to a position of lower potential energy, (under a Newtonian consideration) the gravitational force acting to accelerate the ball.

If you reverse time, unless you know how gravity acts in reverse then how do you know that the ball will roll up the hill rather than stay in place or roll down.

You're saying gravity remains attractive, ergo that if you reverse time the ball still rolls down, the universe still expands, etc..