The author's claim seems to be simply false; his post explicitly says (quoting Sinofsky): "In Windows 8, IE 10 is available as a Metro style app and as a deskt

The author's claim seems to be simply false; his post explicitly says (quoting Sinofsky): "In Windows 8, IE 10 is available as a Metro style app and as a desktop app. The desktop app continues to fully support all plug-ins and extensions." (emphasis mine)