Starving the plant is a common used term that isn’t entirely accurate either.
When you do read my comments in those threads, you will notice I describe the process, and it is more a reduction of nutrients available to the plant.
This “starving” is not really starving at all, if the plant is watered only without nutrients for maybe up to two weeks in soil, the plant is still feeding off what is available in the soil and in its leaves.
I also do mention the length of this low or no nutrients period is entirely dependent on how the plant is fed up to near the end of the grow, and for example, with the Lucas formula, Lucas does not recommend an actual flush at all. This where the “art” comes in and the skill of reading your plants to know when to stop giving added nutrients to the plant.
This “pH water only and no nutrients” might be as short as a day in a well tuned and maintained DWC system.