First thing, If you have "Attributes can increase -ON" Then you cant freeze age, if will continue increasing. If you want players at stay at certain age you should make a seperate Preset with their unique ID and you should run once every year in game.
All the attibutes under "Attributes to ignore" - They wont stay frozen, they will decrease and increase
All the attributes under "Attributes" will stay frozen if "Attributes can increase if - OFF". if "Attributes can increase is - ON" attributes will increase but wont decrease.
Which attributes are you trying to freeze? If you want to develop players there is other way through FMRTE.
Freezer is working fine , but could be improved with other options
One thing you should understand that players will continue train and arrows will appear in game even if they are frozen, That is their natural development.