Steve Kondik involved with LinageOS?

Why is this "quite clear"? From what I heard, Kondick was increasingly marginalized by the powers that be at Cyanogen Inc. until he was all but forced out. I don't see where he was much at fault, if at all.

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The CyanogenMod open-source project has now been discontinued as a direct result of actions taken by Cyanogen Inc., this wouldn't have happened if the project was never commercialized. I believe Steve was the project leader of CyanogenMod at the time Cyanogen Inc. was formed and was instrumental in regards to obtaining funding and commercializing the project. He may well have been marginalized but the fact still stands that the CyanogenMod project would likely still be around today if it wasn't for Steve's actions in helping to create Cyanogen Inc.

CyanogenMod wouldn't exist without "cyanogen" (Steve). I don't believe that commercialization itself was a bad idea - there was and still is a demand for outsourcing software development for mobile devices, and Cyanogen provided a tasteful blend of AOSP with useful additions. Corporate mismanagement by Kirt and others derailed the train. Steve never approved of the "bullet through the head" and other nonsense that started coming out, though he was reluctant to speak against his CEO at the time.

Responding to your original post: yes, Steve Kondik is involved with Lineage OS. He was the one who rallied the community to regroup, and he remains the spiritual leader of the team. LineageOS is the continuation of the community driven CyanogenMod project he started.