Edit you posted above while I was writing the following! 
Before doing anything I suggest you boot you phone into recovery to see what it is.
Boot to Recovery
With the device powered off - hold Volume Down + Power
Use this as a guide [HOWTO] use e-Recovery to wipe & format data before sideloading/install eOS. In this adventure there is nothing to do, you just exploring.
Use https://wiki.lineageos.org/devices/enchilada/install/ by all means, but you do not seem to have included the steps to install the e-Recovery.
The reassurance I mentioned is that that is already a match with the date in Android 13 in the image at the very top of this thread.