If they really support Android 8 (Oreo) on the Nexus 5 (Hammerhead), I might give it a try. LineageOS doesn't support this combination yet, at least not officially.
Now there is a release forked from LOS 15, that supports new devices.
After more investigation: e-0.1 is forked from LOS 14.1 (based on Android 7), e-0.2 from LOS 15.1 (Android 8). The Nexus 5 downloads have an e-0.1 filename, so no Oreo. The website seems to imply that all 49 supported devices can run Oreo which is misleading.