The devil is in the detail.
Line 6 (and other manufacturers for that matter) have been known to make claims like this before. They may say it can run up to 32 effects simultaneously, but what effects are we talking about exactly? For example, on the HD500 you could hit the DSP threshold very, very quickly, especially if you used the better quality reverbs. The only way to get the specified number of simultaneous effects was to run the most stingy chain known to man.
I imagine people aren't going to be able to run 32 effects simultaneously in any way they possibly wish. I could be wrong.
Also, it's all about the code, which is one of the things that one of the Line 6 guys on another forum has stated a few times. Yes, we know that Fractal are putting out some amazing gear, but is their code the most efficient?
Line 6 pretty much pioneered amp modelling. Their fault was that they rested on their laurels and didn't really push the boundaries like Fractal and Kemper have done. Now, there are reports that this product has been under development for some years now, so in fact it looks like they were dabbling in more advanced stuff for quite some time. They also have extensive experience with DSP processing, so they have everything going for them to produce highly efficient code.