Because we don’t maintain a database of living testers — the “relatives” in your report are published ancient specimens from archaeological sites. Matching you to those individuals shows where your paternal lineage was living and spreading in antiquity, which is what this report is built to reveal. For living-cousin matching you’d want a dedicated test like FTDNA Big Y.
Why do you match me to ancient people instead of showing where my haplogroup lives today?
Why we match you to published ancient specimens instead of mapping where your haplogroup lives now.