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Be very happy they told you why they did not want to have anything to do with it.
For navigation: I always watch people who do not know my site when they surf one of my sites. I watch them, not the site.
How do they interact with it, are they happy, searching, thinking or just clicking away in confidence, etc. Do they get frustrated with not finding what they seek ? How fast do they get to where they want to go, ...
Yes, lucky you, getting an explanation from google, fix it and keep working hard.