I would like to think "no," but it's certainly possible. Look at how some of the wording in manuals has remained the same or been only edited piecemeal over the years. My G's manual makes all kinds of phantom references to higher and lower viscosity according to weather and driving conditions, yet explicitly requires only 5w-30 in SM/GF-4 or better. Looking at older manuals, all they did was change a word or two, delete the temperature chart, and update the API/ILSAC specification lettering.
So, it's quite conceivable that if Honda has been recommending one filter for two OCIs for a few decades and they haven't had any warranty issues due to that, there's no reason to change. Of course, that doesn't explain the original reason for one filter for two changes, either. For that, we're likely speculating. The original engineers are likely long retired and probably dead and there may be no records relating to it, unless engineers happened to pass some story down the years.
