TIL that the longest javelin throw was 99.52 meters using a now illegal technique that was considered "out of control". No one has broken this record with modern javelin rules.
using the technique holding the end of the javelin. Officials were so afraid of the out of control nature of the technique that the practice was banned through these rule specifications.
I've spent some time reading the Wikipedia article looking for the relevant part, I guess I was 10 mins early (didn't get the chance to see your comment before that). Here's the (probably) corresponding video, the first video result when searching for the freestyle javelin technique, in case it helps anyone: https://youtu.be/52rvqtiBoow?si=RiLjhJG2ttv-0s1W
Look at the videos posted above. They don't hold it on the end like the OP claims. They hold it on the grip but spin and release like throwing a discus.