It is a very high quality mock-up, you can't tell the difference from 10 meters away. In general, such models of various equipment become another weapon against drones. For this purpose they should be very detailed and withstand more than one hit - so that they don't have to be replaced every day. Such models are already in use in Ukraine and are likely to become even more widespread, especially at some distance from the front. In the role of expensive targets - air defense, radars, SAU - they are of maximum use, because not only drones, but also missiles up to ballistic missiles are spent on them. I think we will soon see mass use of mockups by the Russian army as well.
1337 Group OOSI: "Российские военные захватили в…" - DEF CON Social
https://defcon.social/deck/@oosi/112051137353987795
As long as Ukrainian drones concentrate on tanks that are moving to the front, the danger of hitting decoys is low.
Reminds me of a story from WW2: The Germans had built an airfield with lots of planes - from wood, as a decoy. One day, a single allied bomber appeared and dropped one bomb in the middle of the airfield. The "bomb" was made of wood, too.
No reliable source for story.
https://www.snopes.com/fact-check/wooden-bomb/