Creating a new blog post and amending the old one to add a line at the top that says something like "Update 2020-05-15: New thoughts on the algorithmic complexi

Creating a new blog post and amending the old one to add a line at the top that says something like "Update 2020-05-15: New thoughts on the algorithmic complexity of spline reticulation" with a link to the update post works, and allows the reader to make up their mind on whether they agree with the previous post or the new one.