Agreed 100% that this is absolutely just from russian and like very pro russian sources. The only reason why I give it any credit is that it fits with the reality on the ground. If russia was pushing and got actually stalled, I'd have expected to see a lot more air raids and shelling. Yesterday was weirdly calm, even when it comes to airstrikes, bombings etc. Not exactly the signs of a desperate push
Judging by the many videos of interrogations of Russian POWs, many of them are just kids who barely know where they are, are unmotivated and poorly equipped. Hardly a professional and well-equipped army. There are also indications of logistical challenges (videos of Russian military vehicles running out of fuel, that sort of thing).
Running out of fuel is pretty common in military vehicles as the fuel gauges are at best reliable to half a tank.
Drivers are supposed to track how far they have driven, but if its driven by multiple people and someone forgets to log distance or the vehicle is forced to idle for a long time the distance can be off.
Also a broken fuel gauge will not mark the vehicle as a casualty. Its not critical equipment as your supposed to be tracking fuel usage as a driver.
Again, the source that your other comment cites is a Kremlin propaganda outlet. There's little reason to trust it to accurately represent Ukraine government's position on anything related to this war.
