If you are expecting to use this Lineage OS 16 ROM build as a daily driver, then I would not recommend to use this because there are many thing that does not work.
Instead, I recommend to install the Lineage OS 15.1 build.
– Here is the Lineage OS 15.1 for Nexus 5
It’s is true that Lineage OS 14.1 support has been dropped. I think upgrading to Lineage OS 15.1 one option if you really want to update.