Immediately feed him his favorite meal
Praise him for being such a good cat, and give him some loving hugs.
Teach kitty to follow you by talking to him in a cajoling manner
If you have more than one cat, it may actually be easier to train the second one, because she will want to follow the first.
I suspect the author of this training how-to has cats confused with dogs.
My cats eat the same thing every day, so there's no such thing as a "favorite meal". They glare suspiciously at "cat treats" and won't fall for bribery.
They have a different idea of what constitutes a "good cat" than I. It's similar to being a "good" Blood, or a "good" Crip. They consider loving hugs something to be tolerated in exchange for food, and not a reward.
"Cajoling" my cats turns them smug and superior, which causes them to play hard to get. Yelling at them has the same effect. Ignoring them, same thing.
My little non-conformists are not interested in what their yardmates are doing. They revel in their individuality.
Teaching them to walk on a leash would only work if I *didn't* want them to do it. If I laid the harness on the dining table and sternly forbid them to touch it, THEN they would want it desperately.