Don't tell porkies.
Besides which, buying a board and cutting it into strips is cheaper than buying ready made mdf skirting isn't it?
If he buys regular skirting and makes a cutting list and cuts the stuff to size -plus about 4" per length, he can end up with some pretty small off cuts. And they can be used to make wedges to replace the old ones. He already has the holes hacked out.
What you do is bang the wedges in then mark them with a straight edge. When you cut off the sticking out bits you have perfect grounds to sit the skirting on.