Does luxury vinyl plank flooring fix squeaky hardwood floors?

No, luxury vinyl plank flooring does not fix squeaky hardwood floors because squeaks come from movement at the joists or subfloor beneath the surface. The only reliable way to stop squeaks is to secure or reinforce the structure below the hardwood before installing any finish like LVP. Simply overlaying LVP will trap squeaks but will not eliminate the source, so fixing fasteners or joist connections is necessary for a quiet long-lasting floor.