There's plenty of OSINT available ( Oryx was even mentioned in the article). Take a look around, the only "side" which doesn't make it abundantly clear the Russian advance is an objective failure on every possible front - terrible logistics, ad-hoc consumer equipment like mobile phones used for communication, poorly maintained everything, low morale, hell, even poor planning and navigation ( lots of vehicles stuck in the mud), is the official Russian government propaganda. They've been thoroughly discredited by the lying before the war, and the accidentally published article about it's successful finish ( which is further indication of what the original Russian plan was).