You're always going to have variables. Where you inject and how well the blood flow is in an area, for example. Or half-life of the drug as opposed to the ester itself. Nandrolone lasts longer in the blood once the decanoate ester is cleaved vs testosterone.
This can at least be used as a general guideline and a visual aid as to what's actually going on with half-life and injection timing.
And it backs up what the concept was in the video; same dosage per week with less frequent injections results in larger peaks. This is similar to people popping orals only on workout days, stacked onto their normal injects. You're creating a larger anabolic response for a window of time.