I highly doubt they weren’t aware of the majority of these issues. They didn’t exist because of ignorance towards tank-building. These problem-points probably existed because of corners cut during manufacturing and financial obstacles, which cannot be simply cleared up once the factory is made aware thereof.
It was probably also very good for the Ukranian forces’ morale to hear about this and about how the Russian helpline even ended up helping the enemy with their captured tank.
But yeah, they most likely didn’t just find out how crappy their tanks are manufactured thanks to this one incident.