https://e.foundation supports more devices (still based on LineageOS, but actively de-Googled). My Nexus 5 is one such. They also sell refurbished phones with /e/ pre-installed (in Europe).
/e/ isn't more actively de-googled than lineage, /e/ still uses Google's captive portal and fallback DNS, and that's the only google bits left in AOSP or LineageOS.
Also saying that /e/ support more devices is pretty misleading. Sure you can have /e/ on Nexus 5, but Nougat version only. And you can still get Nougat LineageOS for Nexus 5.
Also if your definition of supported is "works on", there is a LineageOS Oreo for Nexus 5 available. Nexus 5 is no longer officially supported by LineageOS simply because LineageOS has requirements as to the security of the device, but /e/ pretty doesn't care about security.
It uses ecloud for the portal, defaults to the provider DNS (but you can change that), and treats any behind-the-scenes contact with Google (and others) as a bug to be fixed.
I don't think the support range is misleading at all, looking at the device lists, whatever versions are involved. It's support the same as for any free software OS, with maintenance and frequent OTA updates, not random XDA downloads. I don't know if the company provides commercial support. I'm not a developer, so I can't comment on the degree to which they care about security other than it relates to privacy, and the firmware quotes a recent Android security level.
Of course, /e/ is built on LineageOS, and obviously indebted to it. (I was disappointed to find it hadn't been contributing back changes.)
Google dropped support, Broadpwn (CVE-2017-9417) was released, and there are no blobs to fix it. This stops the device from meeting requirements in the Lineage Charter, thus it is dropped from official status.
Nexmon was working on it last I checked, but it's highly unlikely this device will get any of this backported and built for Android.
