myvpn.sargento.com is not a public VPN service you sign up for online. It's a subdomain of Sargento Foods, the cheese and snack company, and it appears to be an internal portal employees use to connect to the corporate network. For that purpose, the site checks out. The security is solid: HTTPS is enforced, browser protections are in place, and the certificate is valid. The hosting is on Sargento's own network, which is exactly what you'd expect from a company-run service.
What about red flags? A public VPN service that hid its contact info and had no privacy policy would be a problem, but here those missing pieces are normal. This site isn't trying to attract customers, so it doesn't need those pages. The robots.txt blocking all crawlers is also appropriate for an internal portal. The only potential concern is the lack of a Wayback Machine snapshot, but that's understandable for a new subdomain.
If someone sends you a link to myvpn.sargento.com and you're not a Sargento employee, be suspicious. It's likely a phishing attempt impersonating a legitimate internal site. But for the people it's meant for, this is a trustworthy portal.