Your view is not the German view vs the Japanese view, it's a German view vs a German view. There's many buildings in Germany which are rebuilds or being rebuilt, not for external tourists (i.e. Disneyland/Las Vegas) but for love of heritage. (I'm not accusing you of believing it, but you're perhaps entertaining it.)
But I don't understand this view. I like the design of old buildings. Why can't we build them again? It's just putting rocks on rocks. Why is it less authentic then putting rocks on rocks according to an uglier, isolating design?
In any case, we're constantly maintaining old buildings. Who knows how many parts of the buildings have been removed and put back, so they can replace some weak part inside?
I think it's highly unlikely that they will be lies. I went to see some old buildings in Indonesia, and they very happily said "we needed to make this construction more stable and restore it, so we removed all the stones, rebuilt the foundations, and put them all back in place".
No-one is lying.
(And if there is some problem, the problem is that modern architects always want to abandon tradition and build ugly buildings that look tacky in 50 years. Humans are capable of showing creativity and following tradition.)