because of the weight of your head, if you move your head towards the ball, your foot will move into position.
that is the theory.
and it isn't new.
It is how batting it supposed to be - Douglas Jardine talked about it in his book published in the 1940's, for example. It is just that "foot to the pitch of the ball" was welded into peoples mind by hundreds of rubbish coaches over the generations.
Do some shadow batting, you want to feel a "topple" a your head goes in line of the imaginary ball and your foot moves into position.
If your foot goes first you end up batting like Alex Hales is at the moment.
To improve your head and foot movement, ensure your posture at the crease is good, not stooped, bending from the hips and not the shoulders and the weight is on the balls of your feet not your heals.
then imagine moving towards a ball, repeatedly across different lines.
it takes some time.
as for the nets, you haven't played for a long time, it will take some time for you to get your confidence against the faster bowling.
keep working at it.
Also if you can, get someone to film you batting so you can coach yourself, rather than listening to 100 other coaches.