Is Kurganetz even made in the same plant that made Armata ?
Kurganetz is an entirely separate program from Armata.
Purpose of the Armata program is to create a unified series of heavy, advanced vehicles. Heavy tank, heavy IFV, etc... They are to equip heavy formations that use the same chassis.
Kurganetz was supposed to be like that, but for 'medium' units. Basically, to replace the existing medium IFVs in particular [such as BMP-series].
Bumerang was for the wheeled formations.
Armata looks like they could bring it into production and service if they want to. Bumerang was delayed by a redesign since there wasn't enough internal space for fully-equipped modern infantry. Bumerang appeared to be working okay, just small on the inside.
Kurganetz is the big problem. Yes, funds were supposed to go to refitting plants for production of this series of vehicle, which was to replace medium units. But corruption prevented this. Seems shameful from a Russian POV, since those funds could have gone into revamping BTR-82 and BMP-3 production into more suitable designs, as is now happening.
Russian manufacturers seem to have preferred creating entirely new designs at great cost and time-investment for the potential of greatly increased capability and serviceability, instead of many iterations on known chassis. Improving BTR-82 and BMP-3 is a relatively low-risk and low-cost project, but seemed to be neglected in favour of next-generation designs that are not ready yet.