Going by a babelfish translation (which delightfully renders Kindergärtnern "child gardners") the article seems a mish-mash of reasonable scepticism and conspiracy nutter type stuff.
On the reasonable side we have, to what extent is it a solo voyage when she had help with the boat
at 14 stops along the way, and even broke off for a flight home (which IIRC was precisely what stopped Zac Sunderland's voyage being accepted for the Guinness book of records as they didn't consider it a circumnavigation
but two half-circle voyages).
On the nutter side we have stuff like, she wasn't really alone, as how could the boat
maintain its course whilst she's asleep unless there was someone else on board to steer it for her? Evidently they haven't heard of wind
vanes etc. nor taken account of the fact that a solo sailor would only sleep for short periods between checking up on things.