Yep. The Yak's basic structure is a welded steel tube. The force on it of having the RH wing ripped off will have most definitely placed enormous stresses on the centre section. The tail wheel has been ripped off, which will have placed strain on the rear fuse structure. Let's not forget the prop was stopped by the ground when it collapsed as it came to rest. How much strain is being placed on the crankshaft? A total engine strip down, measure, NDT, the works. The prop will be written off. Nothing from it will be saved. If it's been in an accident, this is standard procedure. Prop shop personnel will inspect to determine whether it had any role to play in the accident as a matter of investigation by the authorities, then it'll be scrapped. Might be cheaper for the owner to buy a new Yak, than to overhaul that one.
Mind you, this is all conjecture based on photographic evidence.
Here's a pic of a Yak without its skin on at Omaka. Aaron will know more about this particular aircraft. Note also Spitty XIV NH799 in the shadows...
View attachment 490224Yak structure