It should run on lighttp or nginx, it says "highly recommended" meaning it isn't even required so they probably just use it for streaming. Just a guess, you could ask them.
Not sure that wp based cms is worth running your sites on.
"Do you offer any money back guarantee?
No. You can see what you get, there are extensive examples and as long as your server has the minimum requirements the software will work. If any problem arises, we can replace your script if needed, but that's about it. Also, we can't and won't tell your hosting company how to configure their servers, therefore we can't be responsible for any problem with your server. If you're unsure, please avoid purchasing this script"
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www.flamine.com