If by "pixelated" you mean process flaws such as visible dithering patterns, banding, posterization, etc. I did not see this in any of the better work at APIS produced from digital negatives. Certainly you would not have seen it in my carbon or palladium prints, and I did not see it in the Pt./Pd. work of Dick Arentz and a number of other photographers working with digital negatives.
However, I would agree that in some cases there is a digital look that results from the fact that Pt./Pd. prints made from digital negatives have a very linear straight line curve that is quite different from the typical curve of Pt./Pd. prints, which tends to have a very long toe and shoulder. In fact, I started a thread in the gray area of the Alternative photography area that addresses this very point. This is not an issue with my work in carbon since this process is almost perfectly straight line anyway, but I can definitley appreciate the difference between Pt./Pd. prints made with in-camera negatives as opposed to digital negatives.
Sandy