If you take a moment to read the first post again, your answer is there! I can assure you, the owner of the truck did not do this damage neither would he ask to have 26 helicoils installed in his block LOL
The owner of the shop allowed his helper to bottom tap the block. After the helper broke off 3 taps in the block, he came over to check on him to see what he was doing. At that point the helper had used the incorrect tap on 13 of the holes in the block. That is when it was drilled out and helicoiled.
Besides that, I also was very clear in the first post that this was an informative post. It was not a directed slam against the owner of the shop. The post was made so that if someone in the future would do a search on the site, they could find some info on the use of helicoils in this situation.