Firstly, no one can argue that the university ranking is playing one of the roles of selecting criteria for new students by the admission team, however, the problem once again is the fund, for instance, the admission team will be motivated to accept who can support his tuition fees and living expenses even with low academic background and there is a high probability to reject admission of students who graduated from a good university without fund.
Furthermore, it is a profoundly common scenario especially for international students 'Business job'. This can be illustrated by checking the Linkedin and you can easily find out that a lot of master students at KCL and UCL LSE while they graduate from completely low ranking universities
It is known and that was the cases even before this crisis and the main goal is receiving a lot of money from them, Moreover, A strong competition between Australian, New Zeland, UK, Canda, USA and now Chinese universities have involved into this industry to attract more international students to create more money out of poor people like me hoping this degree will benefit us in the future and to flourish the education business models
Thus, Guys let us be realistic, I am strongly assuming that his rejection is due to his lack of fund and off course school can not say this directly to him, but they will try to find a decent excuse and if he does not understand that he must prove to the school his financial capability then I am afraid that 100% rejection
Good luck