Poltava Airport (PLV) lounge questions are moot right now: Ukrainian civilian airspace has been closed to commercial air traffic since Russia's full-scale invasion began in February 2022, and most governments advise against all travel to Ukraine, so no scheduled flights, and therefore no operating passenger lounge, exist at Poltava at present. Before the war, Poltava served only a modest schedule of domestic flights, reflecting its status as a mid-sized regional city rather than a major transport hub, but that pre-war picture has no bearing on today's grounded status.
Poltava is a city in central Ukraine, and like every Ukrainian airport, its civilian air operations have been suspended for the duration of the closed airspace, regardless of what any pre-war lounge or terminal amenity picture might once have looked like. Any information describing lounge access at Poltava predates the closure and does not reflect the current, non-operating status of commercial flights into or out of the airport.
If you have reason to travel to or through Ukraine despite the current advisories, that trip does not currently route through commercial air travel via Poltava or any other Ukrainian airport, and lounge access is not a relevant planning question. Check your home government's official travel advisory for Ukraine directly before making any plans, since both the security situation and the airspace closure are the governing facts here, not lounge amenities. Diplomatic and government sources remain the most reliable channel for updates on both the security situation and any eventual change to the airspace closure.
Whenever Ukrainian airspace reopens to commercial traffic, expect any lounge picture at a regional field like Poltava to rebuild slowly and to be worth rechecking from scratch rather than assuming a pre-2022 amenity list still applies. Until then, the closure and the official travel advisories, not lounge details, are what actually govern any trip involving this airport.