How does Google Keep fetch link preview?

Question

My websites (which are just recovered from an attack) are fetched like this in Google Keep. However testing with Facebook Open Graph Debugger they appear normal. So is there a way to know what mechanism GK uses to fetch link preview?

^{Also asked in Google Help Center}

Answer 1

This is a sign of a cloaking hack. See Fixing the Japanese keyword hack | Web Fundamentals for more