Disclaimer: security specialist here. I've taken a cursory glance.
The SSL certificate for tabletennis11.com carries the following attributes, used by browsers to validate it:
Subject: *.tabletennis11.com
Altnames: DNS:*.tabletennis11.com
The Issuer is Let's Encrypt Authority X3. Everything seems to be valid, and basic crypto setup is sound (TLSv1.2, ECDHE-RSA-AES256-GCM-SHA384 as the preferred cipher suite).
if you go to "tabletennis11.com", the first request is responded to with a 3xx response, redirecting you to
www.tabletennis11.com. The site works as well, but for some or other reason this site has been included on Google's "shitlist", used by Chrome and other browsers derived from it.
The reason Google gives for including the site on it blacklist is that the site apparantly has been compromised and distributes malware. This may or may not be the case, but so-called "waterhole attacks" are pretty common, and many sites suffer cross-site scripting and/or injection vulnerabilities. Anyway, no evidence is supplied, but directions towards the steps the site owner can take to remediate (and get the site re-evaluated, possibly leading to removal from the real-time blacklist) are supplied.
I would hesitate to visit it using vulnerable platforms (Windows, Android), but then again, I would hesitate towards any network contact on these anyway. Too fragile. Even on Linux and mac OS I'd sandbox requests to it, maybe even by using a hit-and-run VM discarded afterwards, if I were to investigate closer.
Edit: no positive indication of abuse of this site as a distribution platform for malware on
https://www.urlvoid.com/scan/tabletennis11.com/, Palo Alto Networks' URL categorization database, Brighcloud test-a-site. If I owned the site I'd ask Google for further explanation.