Thats kinda what the post is saying....depending on the device, the numbers are in different orders. They are saying we need to sort it out so no matter what device you go to use, the numbers will be in the exact same place. So you don't quickly try to type out 8675309 and instead accidentally type out 2615903
The phone numberpad is that way because when touch tone phones were first made, a bunch of different designs were tested, and this one was the favorite, with users being able to input the phone number the fastest, with the fewest errors. I don't know, however, why the computer keypad is different.
https://www.youtube.com/watch?v=kCSzjExvbTQ
http://electronics.howstuffworks.com/question641.htm
https://www.youtube.com/watch?v=kCSzjExvbTQ