They say that you can get "an academically sound qualification which is highly valued internationally", but who is it that values their qualifications this much? There's quite a lot of advertising puffery on the site, but I didn't come away feeling particularly impressed.
Some employers won't even look at you with an online qualification, no one is asking for them, and it is clear that the qualification that gets people jobs is the CELTA, with Trinity as the junior partner. This site also offers the CELTA, and their teaching operation is recognised, so they're probably one of the better ones, but online qualifications offer restricted employment and earning potential. If your friend gets the CELTA, they can work pretty much anywhere and apply for any job, except university and specialist work. If they get the online qualification, they can't. It's a false economy to me- if they want to have a chance of getting reasonable jobs, then get what the employers want.