I'm not sure I agree. If you've got all three wheels on the ground, it's not going to possible to increase the angle of attack.
Yes, quite so. A slip of the keyboard.
The danger of the technique is that if you do happen to land two wheels first and are in the habit of pulling the stick back AFTER you land you will be in for an unpleasant surprise.
Standard procedure in a wheel landing, of course, is to put the stick forward after touching to glue the mains on by decreasing angle of attack and so dumping lift.
QDM