I haven’t done too much research into ADHD (which I don’t have) but if it’s anything like autism (which I do have) then it may well be that it’s just massively under diagnosed in people who aren’t rich, white, boys. I know they aren’t the same but that’s certainly the case for autism, and there is a high rate of co-occurrence between the two.
The “after” is also fairly old - at least before the new safe confinement was built. Here’s what it looked like around 6 years ago: (Apologies for the quality, on mobile and had to shrink it to get it to upload)