Most doubts are because of the 159Km range, interestingly later mx had ranged up to 250Km, bringing it within range of deployed RU systems at airfields within Belarus.
Recent flights into Belarus have, reportedly, been removing S-300 SAM Mx, doesn’t mean they haven’t been replacing them with SSM warheads to target Polish-Ukraine logistics, otherwise why not remove the launchers as well?
https://weaponsystems.net/system/1417-%3E%3E48N6