One of those links talk about the Russians sending 3 brigades towards Avdeyevka, only to limp away with barely a little more than a battalion?
As always in wartime, take claims made by the combatants with a grain of salt, if not a salt tablet. That being said, it is clear that: (1) the Russians are losing vast amounts of material in this offensive, and (2) most of it is being lost due to Russian ineptness, not Ukrainian prowess. The Russians have a lot more material, and men, and a tradition of fighting this way, so they may muddle through in the end. But the cost is appalling.
NSFW NSFL Russian AFV with dismounts riding on top explodes near Ukrainian trench (11 days ago)