It's being called BS on all of the historic aircraft sites, at least for the time being - the story itself has been around for ages, so until there are remains of aircraft actually coming to the surface and photographed (much like the buried Spitfires in Burma)...
Recently there was also a story that came out of a previously unknown, original, Do-335 found in the basement of a castle in Germany, supposedly left there by the Germans at the end of the war - except that it is only a replica, that was constructed in modern years by Holger Bull (known for producing replicas/full scale models of WWII German and "Luftwaffe '46" aircraft), using some original parts.