He didn't. That's a natural shooting motion. When you take a true jump shot, releasing at the peak of your jump, your feet naturally swing forward. It's part of balance and naturally what your lower body does during the release and follow through, especially when you're fading/leaning a bit to get the shot off.
If you're going to label Lowry's shot and a natural aspect of shooting a jumper as an example of seeking contact, you might as well start calling the release and follow through of every jumper as an offensive foul and seeking contact too.
This isn't an example of the hundreds of set shots you see at your local playground or YMCA. True jumpers, your legs kicking forward a bit is completely natural.
It was no different than this
or this