thats a decent technique, CO2 builds in the dough and strengthens the gluten with each fold.
Bread flour is a good choice, I prefer hi gluten flour.
The recipe I got from Paris 60 yrs ago is different, its richer....and bigger.
You can convert everything to ounces and divide it down, its difficult if the recipe is too small, you get recipe drift.
20 eggs and 1 qt cold milk.
4 oz fresh cake yeast (or 2 oz dry).
5 lb high gluten flour
6 oz sugar
2 oz salt
2 lbs uns butter.
Mix until it develops and cover with wet cloth overnite, the next day it will work like modelling clay, not sticky.
I don't have a video of mixing a smaller dough, just baking it. Notice the darker color.
this batch was 8 oz butter, so thats 25% of the above recipe, easy to divide everything down by 4.
In paris they're amost black, thats normal.