Actually, the connection of the vampire horror stories and sex has been written about before, so the author of the essay referred to in the OP isn't original in that respect. But he or she does make more of a specific connection to blood transfusions than I have read before.
Thanks for commenting. I think for some reason the WT leaders in the 30's and 40's had a gut level abhorrence of blood transfusions without really understanding why. It is quite possible that it was a subconscious feeling on their part that was based on sexual repression.
For the record, Fred Franz was born in 1893, Rutherford in 1869.