I think there are 2 possible scenarios:
Scenario 1
The fact that he made it very public (in videos and interviews, etc) that he had to go back to do the military service and basically the whole world knew about made the military and by extension Finland as a whole very embarassed. It’s very archaic in this day and age to have compulsory military training/service anywhere in the world.
Finland government was left with a red face and ordered the military to end his training somehow, and they did just that quietly.
Scenario 2
Lauri offered to make a “donation” to the military and/or its official to the tune of $1m (he could afford it with the new extension). The military and/or it’s official gladly accepted and everybody’s happy.
Which of the scenarios above do you think is the more likely of the 2?