The problem is that the web site is simply broken.
When your browser connects to a web site it sends along a so called "user agent"-string, which specifies which browser, browser version and operating system, you're using.
In order to access the web site from an iPad, you'll need to a use a browser that allows you to change your user agent. That is not possible with the standard Safari.
If you're on a Mac, you can enable the Developer menu in Safari system preferences. From the developer menu, you can choose "User Agent => Google Chrome - Windows", and then you get to the real page.