Presumably the Statement of Reasonable Projection with a future value of €500,000 refers to your pension fund from your previous employer?
There should be a section with 'Assumed Future Contributions' and there will probably be €0.00 entered there as there will be no further contributions to this particular fund. You will be making contributions to a new scheme as you say with your present employer, but the Statement does not take this into account.
This Statement is then probably a frozen in time look at the future value of a fund that is currently worth €81,000 which will have no further contributions to it between now and retirement age and will grow based on the investment returns between now and retirement age.
A fund future value of €500,000, with a present value of €81,000 with 28 years left to run (assuming a retirement age of 65), implies a nominal return of 6.71% approx. which would be reasonable enough assumptions. The Statement should state the return assumption.
The fund value of €500,000 is the value of the fund in the year 2049. The €15k pa is also in 2049 money.
Your statement should also have an inflation assumption stated and also what these amounts (€500k & €15k) represent in today's terms to give you a better feel for the purchasing power of these amounts.