Did you even read what you linked to?
It specifically says:
We have a 5 billion coin inflation rate
having a constant number of coins created means inflation in % converges to 0.
e.g if the total coin supply is 10 coins and 1 coin is created each day then the inflation rate is 10% on the first day 9.09% on the second day 8.33% on the third day etc.
this means that eventually dogecoin's inflation rate will be practically 0.