Assuming the way of determining whether a role was mafioso or maf PR was completly random.
Then we initially had the combinations:
- 3 maf PR
- 2 maf PR, 1 mafioso
- 1 maf PR, 2 mafioso
- 3 mafiosos
When now knowing 1 is mafioso we have the combinations:
- 2 maf PR, 1 mafioso
- 1 maf PR, 2 mafioso
- 3 mafiosos
Basically, the 3 maf PR possibility is gone, regardless what the ratio is between the possibilities. So the 3 mafiosos possibility has increased, and likewise the 2 maf PR+1 mafioso and 1 maf PR + 2 mafioso has increased.
With that said, the way Tim has determined the roles are highly doubtful by randomness, so applying math to this argument is not very helpful anyway.
oles were determined randomly or Aqua is right. The chance of every player being mafioso is increased.