Browser latency and ICMP are different measurements
The live test on this page measures HTTPS response latency to this same site. It includes the browser, TCP/QUIC/TLS behavior, server/CDN response and connection reuse. It is useful for a quick “is this path responsive?” check, but it is not ICMP round-trip time.
For true ICMP, generate a native command, run it on the actual host/router, then paste the output back into the analyzer.