Did not kill All. The point? He used old antiquated 1996-1998 version zappers.
Even on the referenced page, I include percentages that reflect less than 100 percent effectiveness. The same is very true of Beck devices. I have heard complaints of "No results from Beck".
The Thiel study definitely shows a significant improvement by the group that used the zappers combined with nutritional changes over those who made nutritional changes only.
No truth stretching what-so-ever. Links to full documentation are on the referenced page.