It's not though. It's either being obtuse or outright silly. How exactly does "decolonisation" figure in any of the things they said?
> average UK citizens do benefit in some way from their colonial past.
Even if they do, which is debatable (i.e. it's not clear they benefit more from it than people living in other European countries which didn't have extensive colonial empires) what does this have to with nonsensical subjects being taught in universities?