Hi Mike, You are correct-- we now offer only emcomm courses online. We had to take down our old online course platform and have not re-invested in redeveloping the other courses to re-launch them on the new platform. However, we are looking at ways to re purpose the content from those courses. The first effort is to publish an "Introduction to Antenna Modeling" course book utilizing the material from the course you mention.
It seems to me that a "course book" is the new online course replacement when (and if) it comes out. The propagation course formate was very good and can't be replaced with a book. Seems to me the online learning was just not a priority when the ARRL web platform was revamped......well I'm one disappointed ARRL member.