This is not an IFV. This is a vehicle that emerged from the vurnability of MBT's in urban warfare. It has a Dual 30mm autocannon setup, coax MG, 2x 30mm grenade launchers and 4 ATGM missiles wich in term can also fire bunker buster munitions.
Maybe it has faster turret rotation combined with shorter guns so that it can react faster? I am not sure this is going to make it invulnerable to well planned ambushes though.
It's really weird for a westener such as myself to imagine how an armed militia could just waltz around freely and take over random buildings. Why doesn't Ukraine's police or military intervene?