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That is correct, you either have to use the S1 screen or an E3V2 screen. I remember helping someone with the firmware and they were able to get octoprint working with their setup. Here's the thread. The stock S1 Pro firmware was released by Creality. I think there's a way to get things working with octoprint just by editing some config. I would try that first since it's pretty much free before spending money on getting a different screen.
There’s also the synman firmware here https://github.com/synman/Ender-3-S1-Pro-Firmware that works fine with the touchscreen and enables a bunch of new marlin features. I mostly installed it for Host Action Commands for OctoPrint which seems to have worked well.