No, the reason there are two SNAICS here is that the SNAIC 5 provides 24V DC power to the pre-amp of the Supernait and also takes audio signal from the Supernait’s pre-amp back into the Hicap. The SNAIC4 then takes signal from the Hicap back into the Supernait’s power amp section.
With your NAP250DR, instead of the SNAIC4, you would use the DIN-XLR to take signal from the Hicap to the NAP250DR.