Agreed, it was misleading indeed but I assume it's because of his english is a second language just it is for me and sometimes In my head sounds all logical but not when I write it in English :) 

Yes @Asanoha recently cleared this up that all these letters are, the first 3 for two words with unknown length and first 4 letters of remaining 10 words again with unknown length. Then the clue was the checksum word "mother" that cut possible words by half exluding letter "m" and "t" but there are still to many possible combinations. My grand, grand, grand, grand, grand, grand sons and daughters might have an option cracking this with their neurolinks in their sleep :) 

 I appreciate your efforts🙏🏽