[byncnombmub]

I think we agree on rejecting the views of Abdullah Ibn Mas'ood ra on Al-Mu`awwidhatain on the basis of Ijmaa' opposing it. Don't we?

I think if you actually believe that Abdullah ibn Mas`ud didn't know that those surahs were part of the Quran then you have no real reason to believe in any Hadith, or anything else for that matter, transmitted by him, as even the most ignorant Muslim today knows this.