Interesting article; thanks for posting it. I never knew there was a dispute as to the celebration of Easter.
The important thing, as you say, is the fact that He IS risen, that Christ really WAS resurrected, and thus we all shall be as well.
One of our parishoners (with an M.Div. degree) attended a religious conference in Northern Virginia a couple of years ago along with several local clergy, monastics, and laity (he was the sole Orthodox). He was incredulous to discover that only he, a United Methodist preacher, and the two Roman Catholic nuns who were hosting the conference affirmed that the Resurrection was a historical fact.
All of the others described it as myth with one Protestant clergyman even declaring that the Resurrection was rejected by "every serious Biblical scholar" that he knew!