a germans atcos neck NOT on any sort of block if operator did not file correctly?
Cannot speak for Germany, but in Norway any consequence of wrong a/c type in the FPL (i.e wrong WT spacing) would rest squarely on the muppet that filed it incorrectly, in other words the airline.
If you should apply the HD logic, en route controllers must ask for confirmation on filed speed and flight level, as well as route all the time as well.