The PAPI are set for a B747 (A380?) but so too is the ILS. If that was not the case then how would the B747's wheels clear the threshold during a CAT 3 autoland?
And furthermore, all the PAPIs at the major airports in Oz have been moved so they indicate on-slope for long-bodied aircraft flying the ILS. ILS TCH 50ft, PAPI MEHT 72ft.
That means for us "littlees", we get a "fly up" on the PAPI if dong an ILS, or alternatively get a "fly down" on the ILS if we're using the PAPI. Either is quite satisfactory as the runway is, well, only 3000m+ long.