“...they are just laid out in relation to each other, to form a pattern that matches the stars.”
Still - quite a feat. (Or “feet” - as I imagine a lot of pacing was going on. “Okay - now lets walk 512,789 paces THAT way.”) And I imagine they couldn’t just walk it in a straight line. It takes a lot of effort to get to a specific spot while zig-zagging across the terrain and navigating by the sun and stars.
Yes, I’d say it indicates more about their skill as surveyors than any particular astronomical knowledge.