Those are beautiful flowers, but I question the identity of D. dielsiana based on the repeatedly divided styles which are more typical of plants in the Drosera aliciae/natalensis complex. *Although repeatedly divided styles (not simply bifurcated from the base) are occasionally found in D. dielsiana, they are rare.
Here is a photo I consider to be more typical regarding the bifurcation of the styles.
The smaller rosetted plants in your photo are likely to prove closer to D. dielsiana. As I mentioned earlier, D. natalensis and D. dielsiana are closely allied taxa. D. dielsiana was separated from D. natalensis by Exel and Laundon on the basis of seed shape and length. The seeds of D. dielsiana were described as “ovoid, 0.3-0.4x0.2 mm” vs. those of D. natalensis described as “ellipsoid-fusiform, 0.5-0.6 mm long …0.2 mm broad." I assume this rather precise measurement was used to divide the two taxa in the area where their range overlaps, and introgression produces too many phenotypes for floral criteria to be effective.
Drosera dielsiana has been successfully hybridized with D. nidiformis and D. natalensis, and since the F2 generation is likewise fertile, the possibility of different forms is endless.
("sp. Durban" and " sp. 4 South Africa" are likely to be 2 of them)