Pilot reported Z09/PFKA airport runway lights were out of service but there was no NOTAM advising pilots of this condition.

Narrative

On Date I was assigned a flight from ZZZ to Kasigluk (PFKA or Z09). I completed this flight but in the process of doing so I landed at PFKA with runway lights out of service; with the runway illuminated by several villagers lighting the runway using their snow machines and four wheelers. Although the runway end lights were working; the lights along the side were inop. Landing with alternate airport lighting is contrary to my company's operations specifications. Prior to flight I completed a proper preflight planning including a risk assessment. There was no NOTAMs at all for PFKA. It was an unfamiliar airport to me; so I called and discussed the state of the runway with a local pilot. That pilot reported to me that the runway was in good condition. He initially gave me that report; then called someone else and called me back and confirmed it. During this call he stated that the runway lights had been out of service but were now back in service. I also called flight service; and I asked about the NOTAMs for the airport. The Briefer told me the same thing; the lights had been out of service but that NOTAM had been cancelled. I had a normal flight out to the area. The area was good VFR and I briefed and executed a VFR approach while following the RNAV approach to Runway 35. I noted that there was MIRLS in the AFD (Airport/Facility Directory). I briefly considered flying overhead for an airport evaluation but dismissed that idea because it was nighttime so any visual inspection would be limited; and that the AFD stated there was wind turbines within the traffic pattern. So I chose to fly the RNAV approach for its guidance. I saw the runway and cancelled IFR within 15 miles of the airport. I saw the runway end identifier lights and what appeared to me to be normal airport lighting - it was brightly lit up. I flew the approach guidance and followed the altitudes at the IAP and FAF. At approximately 300 ft. and within a ½ mile of the runway I discerned that the runway edge lights were snow machines and four wheelers; rather then normal lighting. The only FAA lighting that was on was the runway end lights; all others was this alternative lights from the machines. All of the people were holding still. With only a few moments to decide I landed the plane normally and parked on the ramp. After landing; several of the villagers came up to the plane. I estimate there were approximately fifty machines that had been on the side of the runway. [Coworkers] went [in to get the passenger]. I had some time to talk with the villagers; who were organized by the local village public safety officer. They stated the lights had been inop due to vandalism; and they had all come to help us land. They all repositioned on the runway prior to the flights departure and held position after being signaled by the public safety officer. I back taxiied to the end of Runway 35 due to the wind direction and strength. I noted again the FAA runway end lights were working; but no others. I departed normally and completed the flight back to ZZZ without any further incident. I debriefed the flight after arriving back at ZZZ because a flight request to a different airport also had an issue with runway lights. In hindsight; I had an expectation of the lights working; and that led to a confirmation bias that everything would be normal. I think that I should have gone around and taken time to reevaluate the situation once I realized it was not what I had expected. An unfamiliar airport should always be approached with due caution.