Referring to https://dev.liferay.com/en/develop/tutorials/-/knowledge_base/7-0/modifying-an-editors-configuration (and same doc for 7.0+), a recent investigation highlighted that a configuration like the one below:
Will not help to completely override Blogs and Blogs admin. This is because for Blogs, editorConfig.allowedContent corresponds to:
In case of web content (or any other place using an editor), it is simply:
The documentation should mention anyhow that not only one EditorConfigContributor is used for all editors, or that Blogs require a separate module to be overridden.