Maybe because your Blog RSS [1] shows releases only, it doesn't seem to show these interesting tidbits?

[1] <link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="http://datatables.net/feeds/releases.xml">

The blog feed is here: https://datatables.net/feeds/blog.xml . It is advertised on the landing page, but it looks like I've missed having it on the blog page! As you say, that has the releases feed - thanks for pointing that out.