Some surveyed paths (i.e. https://www.openstreetmap.org/way/968548618) retagged to bicycle=yes as they are not explicitly designated for use by cyclists (see https://wiki.openstreetmap.org/wiki/Tag:bicycle=designated), but of course can be ridden by (MTB) bike. The same regards foot=yes, as foot=designated requies that a path is (explicitly) managed for foot traffic, which is here not the case.