Are you sure that this isn't simply an assumed return in a theoretical projection and, as such, not an actual return? Even if it was an actual return it would be very poor for a pension fund.
To me this is a red flag.
The only idea that really works is to invest in appropriate assets/funds and then leave them alone as far and for as long as possible.
Anybody with a bright new idea for beating the market is most likely going to lose money or miss out on returns achievable through the above approach.
I strongly suspect that you would be better off looking for a regular PRSA provider with low charges and a good selection of investment funds/options.