How did I overlook that? It's in the linked article and is just the same result of the algorithm applied over a different period.
Upon further review, I find that you are right about the article, but I think the article is grossly inaccurate regarding the nature of the Revised Julian Calendar we New Calendarists follow. Yes, it differs from the Gregorian Calendar, but, no, the difference isn't merely the 13-day shift made in 1582.
Another way of putting this difference: the Julian Calendar falls 3 more days out of sync with the Gregorian Calendar every 400 years, because the Julian has 100 leap years every 400 years, while the Gregorian has only 97. However, the Gregorian Calendar will fall 7 days further out of sync with the Revised
Julian Calendar, the real
New Calendar, every 3200 years, because the Gregorian has [97 x 8 =] 776 leap years every 3200 years, while the Revised Julian has only 769.