Fair enough, but as a matter of balance
If they are no longer going to collect other "nationalities" data, then stop providing services in any other language, other than academic foreign language classes ie Spanish, German, French etc.
I am told by my niece, presumably reliably, that at her boys' school, some pupils effectively have full time teachers to teach in their own foreign language whilst the other 34 pupils have to manage with the one teacher.
IIRC i have also spoken with a teacher whose full time work is taken up with teaching four such pupils.
All at a time of supposed, i'll repeat supposed, austerity.