I am sorry to say this but the above statement shows your ignorance of the Deobandi-Barelwi split. Deobandi-Barelwi split has nothing to do with culture or geography.
Can you tell me anything in the above fatwa that has to do anything with culture? These differences are clearly based on 'aqaid and other fiqhi practices.
If you don't agree with the above fatwa, then you are entitled to your opinion but don't brush it off as "cultural baggage".