@piero, why this link? It has nothing to do with a Galaxy S9 nor with /e/ OS with Exposure Notifications API via microG Services Core v0.2.12.203315 and does not in any way refer to my question to ‘harvey186’.
By the way: For flashing a S9 with /e/ OS I don’t need the /e/asy installer or the manual you linked. My S9 has @ harvey186’s /e/ OS Q-GSI installed - without fastboot commands.
If @ harvey186 continues to use it as its daily driver and actually updates it from time to time, then its /e/ OS Q-GSI ROM is an enriching option - even without definitely knowing how much more the ROM is de-google-d. /e/ OS is and remains different from LineageOS, even though it is visually very similar to LineageOS.