Chicken Stock - Boil Twice?
Think I found the video you are talking about:
Sorted Traditional Ramen @ 3:34

They are not making stock when they dump the water, Ben and James (chefs in the video) are only bringing the water to a boil. They are blanching the pig and chicken to get the scum, this is mainly because the pig parts they are using has a lot of denatured protein. It is not boiled twice Ben says @4:01  "bring to a boil" he doesn't say to leave it there.

Sorted also has these recipes written out in the descriptions of the videos if you ever get confused like this in the future.

The recipe for the "TONKOTSU RAMEN BROTH" (Traditional Ramen),
if you don't want to make ramen just stop after the stock is made.

If you meant these videos:

Ultimate Ramen Chef Battle

Ben is still doing the same thing possibly a different pork bits.

Big Night In Ramen @ 1:09

Same thing just with pork ribs.

Hopefully I was able to help! Good luck and hope your relative gets well soon! It was fun trying to find these videos!