Secret Training  Percentage

Doubt regarding secreet trainig percentage increase.
According to the game, it increases your chances of winning by 25%. However, I consider it very relative, as it can mean the following 2 situations:
SITUATION 1:
It increases an absolute percentage of 25%
Example: Eibar (100M Squad Value) vs FC Barcelona (1000M Squad Value)
Normal chances (I will make them up): 10% vs 90%
Secret trainng chances: 35% (10+25) vs 65%SITUATION 2:
It increases a relative percentage of 25%
Example: Eibar (100M Squad Value) vs FC Barcelona (1000M Squad Value)
Normal chances (I will make them up): 10% vs 90%
Secret trainng chances: 12,5% (25% increase of the normal 10%) vs 87,5%
What is the logic applied by the engine?
In my opinion, first option seems unrealistic.
It doesn't make sense that just by a secret training a team with 75 as average players attributes can have higher than 25% probabilities of winning against a team with 110 average players attributesThanks, regards

Hello
Any feedback?
Thanks

Maybe it means that the attributes are increased by 25%, and that the engine is then applied normally.
Note: I think you mean Training Camp instead of Secret Training.