@Xenia Is she really a citizen of Bangladesh? Or did she choose to become one after being stripped of her British citizenship?
According to this, you don’t automatically get dual citizenship.
What you shared was actually interesting to read. Also if you had read what you just shared:
It shared the court judgement, but then goes on to say:
This was despite the court accepting that conditions in the Al Roj camp would amount to a breach of her right to protection against torture, inhuman or degrading treatment — if she could rely directly on the European Convention on Human Rights, which she cannot. Ms Begum’s solicitor, Daniel Furner of Birnberg Peirce, said that “the logic of the decision will appear baffling, accepting as it does the key underlying factual assessments of extreme danger and extreme unfairness and yet declining to provide any legal remedy”.
It also says:
Was Shamima Begum left stateless?
This is an important question because someone who is British from birth cannot be deprived of their citizenship if they would be left stateless: section 40(4) of the British Nationality Act 1981. In effect, that means that citizenship deprivation can only be deployed against the children of immigrant parents. Those who have inherited another nationality from their parents have less protection against deprivation.
The government argued that Ms Begum, who was born in the UK to Bangladeshi parents, is a citizen of Bangladesh. Proving that is a matter of Bangladeshi nationality law, a hopelessly complicated field. Each side produced an expert witness with opposing takes on how Bangladeshi citizenship is transmitted to children of Bangladeshi heritage born outside the country’s borders.