Oh I am; and skeptical of those who make quantitative claims first, and look for evidence to support those claims later.

In the first cite the only relevant statistics (Carol Tan 1995 study), only 21.8% of fatalities were attributed to any specific cause and that included:
1.3% The motorist was overtaking the bicyclist and failed to see him.
.6% The motorist lost control of the car and struck the bicyclist.
.5% The motorist struck a play vehicle (big wheel, bike with training wheels).
3.9% The motorist was overtaking the bicyclist, cause of the accident unclear.

I assume the rest are attributed to the catch-all of "etc." in order to support the claim that most accidents would not happen to a bicyclist doing the right thing.

I could find nothing supporting your claim in the second cite.