Although the form has questions regarding claiming British citizenship, only those people who are already British citizens will be given confirmation of their citizenship, otherwise, anyone else will just get Indefinite Leave to Remain (ILR) as noted here: Windrush Scheme.

The form asks for details about your, and your parents’ place of birth and their citizenship, to establish this. It isn’t likely that EEA nationals would be able to establish citizenship in this way, however, ILR can be used to apply for naturalisation in the usual way.

See Naturalisation.