That is right, this is definitely for military and aerospace markets (there is not much modern civilian microelectronics manufacturing in Russia), but there are no redundancy or error correction on this chip. It is made on bulk silicon ("civilian" technology, rad-hard chips used SOI/SOS wafers in the past), and there are no tricks implemented to make it radiation hardened (like 8T DICE SRAM cells, embedded ECC with scrubbing, anti-latchup wells, special transistor layout to reduce radiation-induced leakage... e.t.c). But even in non-hardened variant with some precautions it could be used on space applications outside radiation belts.