I'm using Firefox with strict uMatrix settings from a private VPN/proxy (everything goes through a server with a dedicated IP address that only I access via SOCKS5). I see only a blank page that tries to set some cookies, although allowing cookies still results in a blank page. It works via kproxy. I sometimes see trouble with small sites that set strict Cloudflare or Google settings, so even though the site doesn't seem to be using either of those I'd guess it may be an IP block ban possibly following an actual attack from a nearby IP address.