He is correct. He has just mentioned *544# as an example of what PayBill numbers should be.
For example *544# is now used by every network. At least to make things simple for those that have switched networks.
For PayBill it is possible. But then again, someone with 888888 like KPLC has low chances of securing such a PayBill on let’s say Co-op since there is no way you can reserve the PayBill. Some are left for highest bidders like unique mobile numbers.