This product is a cosmetic conditioner, not a growth treatment. Its main purpose is to make lashes and brows look softer, smoother and better conditioned. The source description specifically talks about reducing dryness and making hairs look less brittle, glossier and more defined — that is a grooming effect, not a structural change to the hair follicle.
If a hair has already fallen out or has not yet appeared, no oil can promise to bring it back faster or change how it grows. What an oil like this can do is improve the condition of the hair you already have. Hairs that are less dry and have a smoother surface typically lie more neatly, reflect light better and look more polished. In practice, regular conditioning can make sparse-looking brows appear more orderly and lashes feel less dry after makeup removal.
Manage your expectations accordingly. Results are gradual and depend on consistency, on how you care for the area overall and on your own hair cycle. Use it as part of a normal grooming routine, and treat it as a cosmetic step — not a substitute for medical advice about hair loss or a change in your skin or hair.