Their advice may be quite good, but does the paying market they claim to be training you for really exist? An awful lot of magazines these days expect 'advertorial' or publicity-based feature material for free. I know professional writers - serious prize-winning, many years experience - but even they find themselves increasingly being asked to write for free, for national and international publications. Often, they say no, and stick to a few trusted publishers who still will pay them. But they also know that there are other people out there willing to write for nothing or next to nothing, seriously distorting the market.
Another point; it's one thing to bandy the name of a well-known publication around, but are these writers ready to tell course members what they actually earn, regularly, year on year? A dollar per word, which one of them qoutes, sounds a lot, but honestly it isn't. To write a 500-word piece, unless you know the subject well, could easily require a whole day of research (on your phone bill) and possibly more; then perhaps another few hours or so for writing and checking. From that, you need to deduct around 30% costs - heating, lighting, computer purchase, computer upgrades, accountancy, phone, broadband, stationery, postage. For say 2 days total, that equals just over £100 net per day...And you won't, unless you are well known and pretty good, get fresh commissions every day. Over a week, it's probably below the Uk national minimum wage.
Another thing I have noticed is that writers who are not making enough from writing often start running courses. I know nothing about the people on the website you link to and am making no comment about them, but, as a general point, if writers are so good, I would want to ask, why aren't they making serious money from concentrating on writing full-time?