The version I downloaded did not include these patches, but now that I know about them I will probably grab and install them.
Sylpheed is faster, more stable, and more complete than Evolution is today. It may be the best Linux email client I've used, although I want to spend a little more time with it before making that pronouncement. It also provides an opportunity for someone to become a hero on the Evolution project. Currently the newsreader functionality of Evolution is dormant and unmaintained. Some brave soul could try taking Hiroyuki's newsgroup support from Sylpheed and making it work with Evolution.