I think you forgot to add one of the most popular sites there is and that is fortune jack. Fortune Jack is very popular and a lot of people are making use of it, though I can't really tell the level of their security, but I haven't heard or read any bad stories about them ,just like you will hear about other casinos (there might be, just that I haven't come across one before )and people who I know that are making use of it says that the site is good and they haven't had much or any issues with making use of it.
Even the ones you have mentioned here ,you can't vouch for them to be highly secured. But it's always best for newbies to go for popular casinos instead of the ones that are not popular ,because that way they are lessening the risk they take. Going for a new casino with no reputation yet is a huge risk for anyone
I want to also believe it is a mistake or maybe the OP only needed to mention 5sites, everyone know Fortune jack to be truly trustworthy and safe though but I also expected some other sites that were absent on the list, but like I mentioned earlier, there is possibility that he only needed just 5sites and the good thing is that the sites he listed are all very good and can be recommended
Recommending a site is different from vouching for the site, I feel he is only recommending based on what he knows about those sites, its will now take whoever wants to gamble on the site to go for proper lesson on how to ensure a more secured gambling.