so you have 1/2 pages in the course of a 50 year career, wow I'm totally convinced that is so damming.
There is not a single blog post going back as far as 2009 that shows a change in the ECM dates. go ahead and try and find one. If you believe one or two pages is evidence that he changes the ECM dates and it is not a simple typo,
then you are beyond stupid.
https://www.armstrongeconomics.com/blog/page/1224/You don't understand how forecasting works, you have no understanding about cycles or cyclical analysis and you think your opinion has any worth?