Well I actually agree with some of the things PMU says, not many comp wins on rams this year yet, no official hangtime records just pics and 13 sec claims, there are some VERY powerful foils out there, you should know exactly what you're doing with them and they probably aren't for everyone.
A lot of what PMU says is actually promoting foils I think, you know the (this foil is soo bad ass.." stylee and so on) sounds like a flysurfer ad, which might not be the idea.
Anyway, everyone has a right to their own opinion, personally I think all traction kites (including foils) can be "very dangerous", if you want the maximum performance you'll be using a high performance kite so with a potential to produce huge amounts of power probably in a lot of wind but that's what a lot of us are looking for isn't it, otherwise we wouldn't be flying Psychos, Rhino IIs, X3s, and so on, every kite has it's pros and cons, PMU states both about foils and probably considers the same in LEIs too, can't see anything wrong with that.