You’re going to get better answers if you start your own thread than if you resurrect a thread that’s been inactive for years. The person you addressed your question to hasn’t even logged in for 5 years—he’s not going to answer you.
Information on proper jelqing and stretching technique is all over the forum. Here’s a helpful thread on how to use the search for best results.
The answer to your question is: Yes, he meant that you should avoid the nerve located at the top of the shaft, just beneath the glans. You could theoretically cause damage this nerve, although I don’t believe seriously hurting yourself this way is a very big threat. Just make sure you focus pressure more toward the sides than the top and bottom.