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There are plenty of independent folks doing great work analyzing (and in many cases geolocating) photos of equipment losses. Oryx is great: https://www.oryxspioenkop.com/2022/02/attack-on-europe-docum... Basically yes: this war has been a disaster for Russian armor.
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I think it's pretty clear they didn't. They went in poorly prepared, many soldiers thought they were on exercise and had no idea what they were even doing in Ukraine, and recently it turned out a lot of Russian soldiers have radiation poisoning because they were digging trenches in radioactive soil at Chernobyl, because they'd never even heard of the Chernobyl disaster.
It appears Putin has been thoroughly misinformed by his intelligence service, people lie to their superiors because they don't date to deliver bad news, and Russian supplies have been crippled by corruption.