Even if he found some effective way to recognize words (I do not know if there are online dictionaries that can assist with these types of games), statistically speaking, he should have offered at least one incorrect word matching the given pattern. Unless, of course, he knew all the correct answers in advance, and the entire game was merely a farce for merit abuse.
That was the main reason I stopped the game, while searching for words I normally use the "7 letter words with n at the 3rd position" as my keyword and even with that I still come across so many results that would have been a perfect choice but for @_hiloveua_ not missing anyone or making a wrong choice is kinda suspicious.
Sorry to ask, @JollyGood did you PM them about this thread? because I can see that only @hatchy has replied to this thread meanwhile some others are active in the forum but haven't said anything concerning the thread. I doubt that they are using telegram notification bot so it will be a good idea to pm them if you haven't done so already.