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The main part of Mantan Web's article actually discussed the new manga releases of the week, including but limited to the first book volume for To Love-Ru -Trouble- Darkness. The mention of a "planned" anime for the To Love-Ru -Trouble- Darkness manga came in the last sentence of the second paragraph. The website then removed the original article and posted a new version on Monday that no longer mentions a planned anime.
The publisher Shueisha itself has not announced anime plans for To Love-Ru -Trouble- Darkness, and Mantan Web's article did not say that an anime was already in production.
Update: The official Twitter account for the To Love-Ru anime said on Monday evening that the information about a planned anime adaptation of the To Love-Ru -Trouble- Darkness spinoff "seems to be mistaken."
Source: ANN