That's interesting VampyreWolf, my strop is mounted to a board & I hold it while stropping. There's very little give ,(other than the leather giving under pressure). I've tried the method on the site you posted but got better results with a very flat angle.
As Cliff Stamp pointed out, there's less tendency to create a convex edge or roll the edge with an acute angle. As long as you're actually reaching the edge , it does the job.
Guess we all have to find what works best for ourselves & the particular knife we're working on. That's what makes these forums so handy.
Calyth, glad you've got it working. Keep in mind to strop after using the knife. If you just touch it up that way , it'll never need major work unless you damage the edge.
One other thing I've found helpful. If you're ever using a knife & it starts to dull, just unbuckle your belt & pull it out of the 1st loop. If you then pull it tight, the buckle will catch the loop on the other side & allow you to twist the belt so that you can strop on the inside surface. I've done this more than once to get through some skinning chores. Mostly I just carry better steel these days but the belt's always there if ya need it.