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Without being able to see the map I really don't know for sure.
That being said these are supposed to be off the shelf maps so a stage 3 would have been a turbo back exhaust, cobb SF intake, Cobb 1050 injectors, fuel pump, I think that Cobb made the map using their fuel rail kit and their fuel pressure regulator kit as well. I don't know if it would work on a 2020 but I would guess that it would. Ideally you would check with a tuner and see if they have a better answer. I tuned a few of these cars on open source a long time ago but I haven't worked with the Cobb stuff much and don't really know the ins and outs of how they set everything up.
I have 2 maps if you want to look at them. One is for a 2016 sti and a 2019 sti. Both have had similar modifications. I'm just looking for a base line so I can get a protune later. I cannot seem to find anyone near me to just tune the car.
 
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