I think you're eligible for the tuition fee loan but not the maintenance loan. I think that SFE were suggesting that you'd be eligible under point 4 here
4: People with the right of permanent residence in the UK
If you satisfy all the conditions under this category, you will be
eligible for full Student Support. To be eligible:
(a) you have the right of permanent residence in the UK; and
(b) you are ordinarily resident in England on the first day of the
first academic year of your course; and
(c) you were ordinarily resident in the UK and Islands for three years
before the first day of the first academic year of the course; and
(d) if your three-year residence in the UK and Islands was at any time
mainly for the purpose of receiving full-time education, you must have
been ordinarily resident in the UK or elsewhere in the EEA and/or
Switzerland immediately prior to the three-year period of ordinary
residence in the UK and Islands. It does not matter if you were in the
EEA and/or Switzerland mainly in order to receive full-time education
during this earlier period.
Point (b) would be the reason for asking you to prove you were in England on 1 September, but since you were under three years old when you left the UK, you wouldn't satisfy point (c).
You should be eligible for the tuition fee loan under point 2
2: EU nationals, and family
If you satisfy all the conditions under this category only, you are
eligible only for a loan to pay your tuition fees. To be eligible:
(a) on the first day of the first academic year of the course, you
must be:
a UK national; or a non-UK EU national who is in the UK as a
self-sufficient person or as a student; the relevant family member of
such a person above; and
(b) you must have been ordinarily resident in the EEA and/or
Switzerland for three years before the first day of the first academic
year of the course; and
(c) the main purpose for your residence in the EEA and/or Switzerland
must not have been to receive full-time education during any part of
the three year period.