Earlier quoted context omitted.
You posted data about parking tickets. This is not evidence that street parking provides sufficient capacity.
If you have actual data about parking usage in this area, I'm all ears. I'm much less interested in your axiomatic derivation of how parking here works. At any rate: I answered your question about "where all this on-street parking comes from". You can do the math on the carrying capacity of an Oak Park street for parking; you've got the maps, after all.
If there’s enough street parking, then why the proposal to charge so much for street parking to moderate demand?