Their principal tank loss, by the hundred, is the T72BV3 mod 2016.
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Oryxs reports: 70 T-72B3 Obr. 2016: destroyed, abandoned, captured. They must have left the V out. But its only 70, not hundreds of them.
Only 300 tanks (in total to date) were lost; some of which were recaptured by the Russians.
That is like the stories about Russian aircraft losses - only 12 have been documented destroyed or damaged - of those NO SU-30s, SU-35s, TU-95s, TU-160Ms are in the mix or even reported active in the area. Air superiority or supremacy cannot be archived without them.
OK, fair cop, I was assuming the B3’s in the type, which puts that class at over a hundred. That is, still, the largest category of observed lost tank, which is a current upgraded model. The response was to an allegation that the Russians had attacked with their second rate units.
On your comment, observed losses like these cannot be assumed to be the actual loss, but the very bare minimum estimate. These have had their status solidly established. But a large number of others cannot have been observed closely by enemy forces as many were certainly lost by advancing forces and are now in friendly territory, unavailable to documentation by Ukrainians. And there are certainly others that even the Ukrainians didn’t bother to photograph and upload to social media.
Personally I think the Ukrainian official loss estimate is plausible given those factors.