I would say stonewalling has an active element to it, while the second item is more passive, or passive-aggressive. In stonewalling, there still is engagement between the parties, like in the siblings tv commercials where one kid annoys the other by NEARLY poking while saying, "im not touching you!" In the 2nd situation, there would be little or no response to your attempts at normal communication. They ghost you while you are still there.

Interesting that they are both under the same heading in the article.