If in the german iD version you choose the option “verdichtet” for a track surface the tag will read surface=compacted. You have to type “verdichtet” manually into the list of properties to upload it like that and I don’t know why someone would choose this option.
Nevertheless I believe anyone doing so may probably not be aware of the meaning of verdichtet=compacted as described in the wiki. One can understand a track over a grassy surface hardened by regular use (and dry conditions) or similar as verdichtet. A general retagging could easily lead to bad results if you don’t know the local conditions imho.