That’s not entirely true. They are manufactured by Liebherr but so heavily tweaked by Miele that „rebranding“ is not exactly the right word. That doesn’t mean they are better or inferior than regular Liebherr products though.
Liebherr fridges & freezers are known to be very good too, if only a slightly cheaper due to carrying a less fancy trademark.
This is another trick, find out the high quality brands and find who they're OEMing, and get those.