Most of those attacks were done in a fairly traditional manner, and the bombs were dropped/rockets fired, from a considerable distance.
"Bazooka Charlie" was a bit of a special case. His tactic was to come in low (trimming the wheat field low), and hold his fire until he was within 100 yards, and often much less. Other scout pilots tried to copy him, and quickly gave up on it as far too terrifying to attempt.
At least two of his tank kills were doing close air support for infantry who were able to over-run the German position as a result, and able to confirm the kills on the spot.
In another case, after shooting up a small supply column, he landed beside the wrecked vehicles, dismounted and grabbed a discarded rifle, then captured and held a half dozens Germans who hadn't run fast enough, then casually waited for American infantry to catch up with him to take his prisoners into custody so he could fly back to base.
Charlie appears to have been that perfect combination of fearless, foolish, and lucky.