No, that isn't accurate advice. You should not be feeding an adult snake at an interval shorter than seven days. Is your snake gaining weight? Is the top of its back nicely rounded? (the snake isn't triangle-shaped, in cross section and its spine isn't sharp or promenent?)
How big is the diameter of the mouse you are feeding in relation to the largest diameter of the snake? Is the prey 1 to 1.5 times as big as the snake?
With a large snake, feeding adult mice, you will eventually reach a point where you are feeding multiple prey items. For instance, my big kingsnake who weighs over 900 grams eats two mice one week, then three adult mice the next week, seven days later. This keeps him growing very slowly. This snake could be eating single equivalent rats, but I don't have anything else that can eat rats, and I was told he didn't like rats anyway, so I haven't tried.
Unless you are in a big hurry to grow up your snake for breeding purposes, slow, steady growth is just fine. Probably healthier for the snake. You really can't judge growth accurately by length- you need to buy a gram scale to accurately weigh your snake, or just feed a prey item 1.5 times the snake's diameter and don't worry about it.
Another thing to consider when picking a prey size is how long the feeding lump is present. Do you still see a nice lump in your snake 24 hours later? Then the prey size is adequate. The lump should be gone or nearly so after 48 hours.
Nanci