What a DCF model is really doing
DCF valuation starts with an operating assumption rather than a market quote. You project the cash a business may generate in future years, then discount each forecast amount by a required rate of return that reflects the risk of waiting for those cash flows.
That approach matters because a dollar of cash expected several years from now is not worth a full dollar today. The higher the discount rate, the less those future cash flows are worth in present-value terms. That is why DCF is sensitive to both the growth assumptions and the discount rate selected by the analyst.