also, the domain is showing as having been Updated Date: 2019-07-04T12:06:14Z full dns propagation can take days, so if a change has been made today then it is to be expected that it is not accessbile in some places.
Colleagues on different ISP are having no problem at all.
I've flushed DNS cache. DNS servers are set correctly to 184.108.40.206 & 220.127.116.11.
Works just fine from my cell phone on EE.
Before anything else just ping the address and see what gets returned. I get 18.104.22.168 and can browse the website perfectly from a VM connection (admittedly though I don’t use VM’s DNS servers). I suppose it could conceivably been caught up in VM’s websafe filters, seems a bit of a stretch though.
You need to traceroute to the host name so www.aforza.com not just the domain name. And yes I can see the web site perfectly.
And no, it won’t mess anything up to use a third party DNS (I happen to use OpenDNS) BUT, the current firmware on the Hub 3 doesn't allow you to change the DNS address in the DHCP scope, so the only way to do it is to manually set a DNS server address on all (or at least some for testing) of your devices or put the Hub in modem mode, do everything with your own router and then you can set things to whatever you want. BTW not using VM’s DNS servers will break the web filtering (websafe) feature although there are quite mixed reviews as to how good it actually is at it’s job anyway.
Personally, I would pop the Hub into Modem mode and connect a single PC (you may need to reboot the Hub to get a connection) This will give you a different IP address which would test if your IP address is being blocked by the site This is not unusual occurrence as IP addresses can get caught up in spam filters. You will need to use http://192.168.100.1 to get back into router mode.
The site is showing here so the site looks OK and there is no general routing issue A trace route as advised would show up any local routing issues