The author is clueless.The omer was originally an agricultural countdown to the harvest, having nothing to do with the desert wanderings. We added an historical and religious meaning, as we did to all our biblical holidays. There's nothing wrong with doing that unless you have people like this author.
Entrance to Jerusalem's Old City to be opened to residents, Israeli citizens and tourists (Haaretz)
from the article: Why are so many Jews unsuccessful at counting the Omer?