the article is complaining about adaptations in general and Disney in particular, which aren't billed as "The Brothers Grimm's Cinderella" etc. it's specifically complaining that the nastier bits were removed at all, not that doing so was impugning the Grimms' authorial intent
Changing the text and claiming that they are still the versions written by those people is the issue.
By all means sanitise and change fairy stories as much as you like, but they must be released under the new authors name, not the originals.