No. They are two different projects.
Lineage is about providing a Google free version of android AOSP and supporting as many phones as possible.
Graphene is about making a privacy centric version of android that can run Google apps sandboxed. Graphene only supports pixel phones.
Lineage is not about providing a google free version of Android. It does not contain google apps, for licensing reasons, probably also to let the user choose. But it does not go further, all the other stuff like captive portal check, agps, dns etc still uses google servers. It’s not “degoogled” in any way. Love lineage btw but we need to be aware of what it is and isn’t.
What happened to LineageOS?
Nothing. What makes you think something happened to it?
I’ve always found it both weird and ironic that GrapheneOS is only available for Pixel phones when the whole principle of the project is basically “we don’t trust Google”.