This card is correct at least as far as FA and AMBOSS are concerned; positive selection in the cortex is asking “Can T-cells bind any MHC?” and is where T-cells express both
The thymic medulla is where the T-cell binds to it’s higher affinity CD → loses lower affinity CD
Reading from AMBOSS for maintainers that see this: https://next.amboss.com/us/article/x50Emg?q=thymic%20medulla#Zb648e3ccdd39ac912f7d40f71b5d94c0