The area wasn't exactly densely populated. It was a region not too deep into the High Tier either. However, densely to mortals versus what a cultivator might expect it to be were on entirely different levels. In a world like this one, even if the homes were dozens of miles apart, it was a matter of a glance for the various home owners to check on what was going on, let alone the fact these homes weren't nearly so spaced out.
Janus' home was a mansion that squared off what was at least 50 meters longitudinally and latitudinally for itself. But for experts like them, this matter was hardly the effort of a single step.
Usually, privacy in these regions was protected with the use of formations, but as Janus had said… his own had just shattered, causing the senses of the entire neighborhood to fall on him…