Cosmas and Enoch are not authorities, godly or otherwise.  They aren't bishops or Saints or Church Fathers.  Enoch wasn't even a Christian, since he lived before the time of Christ.  They are just some people who wrote down their ideas. There is no reason to give them precedence over anyone else.

Very little is known about Cosmas.  Many scholars think he was a Nestorian.  And virtually nothing is known about the author of the apocryphal Book of Enoch, other than the time period in which he wrote.  It was not the Enoch mentioned in Scripture.

Practically every heresy that has ever existed was based on misinterpreting Scripture so I am not going to automatically accept claims just because there are some Scripture quotes thrown into them.  I test everything against Church teaching and physical reality.  This is not a disregard for Scripture but basic prudence.  

When it comes to the shape of the earth, there are pagan authors who measure up better than Cosmas and Enoch.

The source is a tourist attraction which publishes this LEGEND on their website to make it seem more romantic.

https://gotykhouse.eu/en/the-legend-of-anne-schilling/

It does not even pretend to be history.  But apparently it does not matter if there is no good reason to think it is true if it blackens the name of Copernicus.