No. The robotic radical prostatectomy is different from the robotic simple/partial prostatectomy. Dr Bevan-Thomas performs both the robotic radical and the simple/partial prostatectomies every week but for different reasons.
For men with larger prostates (BPH) greater than 100 grams, Dr. B-T uses the robotic simple/partial prostatectomy. The simple prostatectomy removes only the inner part of the prostate. (See link here to the robotic simple section.)
To put this into perspective, the average prostate is roughly 40 grams, 100 grams is over twice the size of the average prostate. Doc B-T performs this procedure because it provides better symptom relief for men with larger prostates who aren’t candidates for any of the less-invasive procedures.
The radical prostatectomy, on the other hand, removes the entire prostate. Dr. B-T performs this procedure for prostate cancer. Think of the prostate as an orange with the peel around it. While the simple prostatectomy removes the inner part of the orange, the radical prostatectomy removes the entire orange. This is necessary for two reasons.
First, roughly 80% of prostate cancer starts in the peripheral (orange peel) part of the prostate, so leaving that part of the prostate behind would not cure the cancer.
Second, in order to ensure that the prostate cancer is gone, the entire prostate should be removed. The PSA [internal link here?] after this surgery should be undetectable — less than 0.1. Just as importantly, if any of the prostate is left behind, it could harbor a small focus of cancer that could grow later. This would require further treatment.