They weren’t complaining, just giving you an example of how a central European country still isn’t “cleaned up” even after all these years. That country being Germany has nothing to do with their point.
It is for all intent and purpose cleaned up, finding eod is usually things people collected and shouldn’t have or things deeply buried. Korea, Vietnam, Cambodia have active surface level minefields that have been known and documented since during the war, it isn’t a matter of hard to find in those places it’s a matter of allied powers simply not having any interest in demining the places they mined.