Coffee grounds can give a mixture an obvious gritty texture, which explains their appearance in homemade body-scrub recipes. The source also makes broader claims about skin benefits. Those are different questions: the presence of coffee material does not by itself demonstrate an effect on wrinkles, inflammation or other skin concerns.
A cosmetic preparation involves the whole formula, not just the featured ingredient. Particle size, the liquid or oil mixed with it, handling and storage all influence what the product is like to use. A kitchen recipe is not evidence that a mixture is suitable for every body area or skin type, and a preservative-free description is not a complete safety assessment.
Treat commercial claims and homemade instructions critically. Do not infer that roasting removes every unwanted substance or that an organic label establishes a particular cosmetic outcome. Follow suitable product information and seek qualified advice about a specific skin concern rather than using a coffee article to diagnose or treat it. Reusing an ingredient can be interesting without assigning it benefits that have not been established for the actual preparation.
The conversation
A good question can make a better brew.