The readme cites an increase of 7 to 15 percent in landing page conversions, but couldn't that be attributed simply due to the added content? I assume these st

The readme cites an increase of 7 to 15 percent in landing page conversions, but couldn't that be attributed simply due to the added content? I assume these statistics are based on comparing conversion rates on site A with conversion rates on site A + some free offer when the user tries to leave. Wouldn't conversion increase with around the same amount if the free offer would be already visible on page load?