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@whomreally I don't know how to post this but I solved my issue, sometimes asking the question makes you find the answer! Hope this can help people:
Thinking this is an issue of fastboot not recognizing the tablet, I went on my S20 PC Windows 10 and followed this advice https://forum.fairphone.com/t/fp3-how-to-solve-non-recognized-fp3-device-in-fastboot-on-a-win10-device-easy-e-os-installer/68674/15. Since I had previously connected my tablet before, with it disconnected I went to device manager>view>show hidden devices and there was something like other devices. I went to update driver>update driver from windows update and there it took me to Windows updates in settings and I saw optional drivers and installed both of those (something like android and fastboot). I also read this (https://forum.fairphone.com/t/problem-to-unlock-device-state-with-fastboot-command/69113/2) then installed the https://developer.android.com/studio/releases/platform-tools and added the path to the environment variables. I opened the tablet in fastboot by pressing volume up and power while closed, then in recovery chose boot into bootloader. I plugged the tablet to PC, ran cmd as admin, ran adb devices that started but listed no devices. Then I ran fastboot devices and it listed my tablet. I opened ubports-installer (not as admin), chose device manually and followed instructions and files pushed to the device in recovery mode. It then rebooted into ubuntu logo, then was turning and eventually I had Ubuntu Touch up and running.