Everything there are accurate, you really need to listen to the begining of the podcast (the introductory part) as March 19, 2013 was clearly stated
Not everything. If you understand the difference in the podcast and the introduction article. It is misleading and inaccurate. The author can mention the day March 19, 2013 and eight years exactly from that day is March 21, 2021. The article is totally correct if it was released exactly on March 19, 2021, not March 21, 2021. The article was not updated or edited after the releasing time.
It is a small inaccuracy in the article. One or two days don't change our lives but a perfect accuracy need it.