Both articles are from a monthly column, "The Classroom" by Jerry Hayes. People send in questions for Jerry to respond to.
The July question revolved around the number of times per year OAV should be administered and the October questioner referenced the July question/answer but indicated they performed multiple OAV treatments and experienced Queen loss.
My interpretation of the answers is that Mr. Hayes is not a proponent of using OAV more than once per year - at most, but instead references the use of Apiguard and Apivar. Neither question referenced size of hive, OAV dosage, etc.
Hope this helps.
Randy Oliver's website has a lot of information on OAV. You may want to check it out.
And as many other have said . . . " Ask 10 Beekeepers a question and you will get 12 different answers"