The video shows the head only and it is extremely boring.
https://youtu.be/wBrzH4jNCTc
Pictures show the proper injector tool (new purchase).
Using regular 27mm deep socket I managed to bend the nipples of my 740td's new injectors and 4of them leak now but that is another long story...
Use the right tools and the job gets done faster better safer
I think the regular 27mm sockets dont fit well between the tight space of the injector and the cyl head itself. Because the wall thickness of those sockets is way too thick. Especially the older 6point versions. I think that is how PO chipped the cylinder head.
I also think that this engine spent years maybe decades not running. Now it is becoming a parts donor or maybe stays whole...for experiments and to exercise repairs/maintenance...better than getting junked