Great recipe and very good insight into making an excellent sauce. Just one thing that is mostly off base. It's this part:
'If you have an electric stove, carry it out to the curb and replace with a gas stove before beginning'
Most serious cooks that I know would never let an electric stove become a constraint, but instead they would adapt their technique to the tools they have. Note that in episodes of 'The French Chef' Julia Child's iconic cooking show she used an electric range exclusively. Almost everyone knows she cooked circles around virtually everyone of her peers then and most professionals since.
https://www.pbs.org/video/the-french...n-soup-dv2ts5/