Why oplot-t(2010s) have less armor with T-80U(1980s)?



So Gaijin believes that through thirty years of effort from the 1980s to the 2010s, Ukrainians have used new manufacturing techniques, multi-layer ERA technology, and better “duplet” ERA to obtain a T-80U with poorer protection? And other countries think it is good, defeated T-80U in the bidding and received the order?
is that like some joke?like gaijin says"nobody know tank better than me"?

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