In the table of "Adjectives with indefinite articles (ein, eine) or kein," in the Nominative Singular Masculine frame of the Matrix, 'RotWein' has been contracted to one word which therefore contains no adjective or adjective ending. I believe the intent of the original writers was to leave this as two words with the illustrative "er" ending for adjective rot, which if I remember the rule from 43 years ago in High School means it should read "roter Wein." And should rote then not be capitalized as now it is an adjective as the Matrix requires and not a noun. As is no stands, there is no illustrative ending for the nominative, singular, masculine case. There may be examples later showing this as and "e" however, the rule I remember suggests it should be "er" in the case of a weak, Ein, indefinite articles the indefinite article adjectives become strong? We should check with on of your experts I think.
Should this instead be:
Nominative ein roter wein eine gute Wurst ein altes Haus
This may have been "corrected" incorrectly by a final post edit spelling check.
BTW this is question.