Probably your wifi provider is blocking the website or some bad cached records… try accessing in a private tab or different browser or clearing DNS cache on your computer:
Windows (Command Prompt):
I hope you do realize this is a macOS only command. Yes, both macOS and Linux is Unix-like, but this doesn’t mean all of the commands are interchangable.
On Linux (systemd) there’s
sudo resolvectl flush-caches
I admit that I haven’t touched non-systemd Linux, so I cannot tell the command for other systems.
systemd-resolved is probably most common by now. Before the big systemd takeover, you had a hodgepodge of different resolvers, but dnsmasq was quite common for personal use. But I remember that at least Ubuntu didn’t have a local DNS resolver at all, so there was no local cache to begin with.