But at this point he is probably doing more harm than good, for the reasons you describe.
Or are you saying Kurzweil's contributions are very small in comparison?
As a person he should be judged holistically, and that includes his affinity for the occult. If he were to be a professor of Stanford today, his beliefs on the supernatural should be taken into consideration and viewed as a lack of intellectual integrity(although with all that we know now versus what humanity knew during his time, his stance would most likely be different today).
The Newton Project at University of Sussex and Cambridge University has collaborated with University of King's College in Halifax, Canada, and Indiana University to collect and transcribed his all of his writings. Their progress widget has them at 4,950,000 words so far.