That's great and all for really low level and really low tiered players. However, if you're more advanced, those are some very, very, VERY misguided rules.
For the reverse angle - I detest the reverse angle. Why? The breaks at the beginning of a putt are much more important than the breaks at the end of one. For instance, if you have a 20 foot putt where the first 10 feet break right to left, and the last 10 feet break left to right, what do you do? If your answer is "hit it straight, it'll even out"...BUZZ! The first 10 feet is the "dominant" break, and the last 10 is the "recessive" break. You have to put into the dominant break moreso than the recessive. A straight put, in the above scenario, will land you quite a bit left of the hole.
Also, your "even elevation for distance" suggestion will, give or take, work for standard, fast, and (probably) very fast greens. On tournament and championship (especially championship) greens, that will spell your doom. Do you know what a 15 foot putt will do on champ greens when you're 25 feet from the hole with a decline of 10? It will roll a good 35 feet downhill.
Therefore, if you're new and need a rather simplistic method to adjust your game, this advice is fine. If you're more advanced, I would seriously disregard it.