Her הוא sounds like "oo".
Good. Do you think native speakers don't make that mistake (as well as many other)? At least Duolingo prepares you to that.
Well, you've certainly got a point there.
It is the native Israeli pronounciation. ה is the sound of breathing out. It may be harder or lighter.
I hear a remarkably light 'h' at the beginning though.
Hu menasa lisgor et ha-khalon.