Even if Ukraine is telling the truth, which I doubt.
Do you correlate the losses in equipment in favor of Ukraine? Ukraine has lost much more valuable than tanks... do I need to list it?
This war will be decided militarily, sure Ukraine lost a whole lot in terms of resources (infrastructure, economy, mass migration towards Europe etc).
But Putin only wins IF he manages to somehow subjugate the entire Ukraine, install a puppet government in Kyiv and make it more "friendly" to Russia. We all know this wont happen because Russia doesn't able to somehow subjugate the Ukraine army. The Russians retreated from Kyiv, Chernihiv and Sumy. Now it's in the process of retreating from Kharkiv.......What's next ? A Ukrainian offensive to lift the siege of Azovstal ?
And oh, this war has hit Russia hard too, think about the sanctions and the impact it will have on Russia and Russian society.