A real assessment measures your blood pressure, reads your full medication list, examines you, and orders bloods. This does none of that, and any one of them could change the answer entirely.
In particular, it cannot detect the thing that matters most: erectile dysfunction is an early marker of cardiovascular disease and diabetes, and no questionnaire substitutes for having those checked. Whatever this tool suggests, that workup still belongs in your plan.
Use it to arrive at an appointment with a specific question rather than a vague worry. That is what it is good for — see how to raise it with a clinician.