I believe someone form UKR gov 'validated' it, that said, it's probably mostly a myth though possibly maybe someone did do a few kills.

It's an ideal bit of propaganda to have though.

If the Ukranians pull through this, the 'Ghost of Kyiv' will be utterly mythologized. There will be movies, video games, statues, restaurants, brands of beer etc..

Myths are hugely effective in wartime. It's a phenomenon literally called a ghost and you're seriously saying 'but there's no proof???'

Ghost of Kyiv fights a war in the Russian minds. Consider the legend of Juba, the Iraqi sniper who killed many US soldiers swiftly and suddenly. Hard to do anything out there without wondering if Juba has you in his sights. Similarly, you could be flying along on a routine Russian recon mission and without warning get blown away by the Ghost of Kyiv.

Ghost of Grozny Grad.