My intuition tells me that just because a survey was conducted doesn't explain the behavior of verifying documents in itself. A Google Forms survey with 78 responses is like hearing a whisper; it smells like observation rather than the direct cause of travelers' behavior.
The link is too direct, ignoring the multiple factors that push people to verify their papers in advance or at the last minute, such as visa requirements or simple procrastination.
For it to be a true explanation, one would need to see how the responses to this survey specifically inform the timing of document verification, not just a correlation.
Without that, this statement is a bit like saying the crowing of the rooster makes the sun rise; it's an observation, not an established causal relationship.