I looked into this. Confirmed there is a problem here.
Back before 2020, the site tracked GS in a different way than it does now. The result is that the innings denominator before 2020 is only including relief pitchers.
I will spend some time writing a script to go back and update pre-2020 stats to reflect pitcher GS correctly. I’ll update here when that’s done and then the historical P/IP should look a lot better.
Just whipped up a script to fix this and ran it, and I believe P/IP before 2020 now looks pretty good.
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