Laura, weight training is always a great idea, no matter how far you are from your goal, or whether you're at your goal. I think the point of the original list is to emphasize that spot reducing won't reduce actual fat. But building muscle generally does help to tighten you up (and, long term, reduces fat all over).
I personally think that the original article is a bit dodgy, because it assumes that the ONLY reason someone might work their legs is to spot reduce. That said, lifting weights with a proper program designed to build muscle all over (and for me, as efficiently as possible) is the right thing to do.
If you want help starting a program, post in the main forum. There are lots of people with lots of knowledge with lots of great ideas!