Counter-Terrorism and Security Bill

I confess that I am by no means convinced of the legality of what is being suggested under temporary exclusion orders, which will, no doubt, be known in due course as TEOs, given our enthusiasm for acronyms. What is the position of someone who declines to accept conditions of return and who is not subject to deportation by the country in which they temporarily finds themselves? Are they not de facto stateless in such circumstances?