Mick,
Dunlop tyre design drawing shows the loads and pressures used in the 139 are outside the normal limits, but inside the emergency limits. Since you can only buy the tyres from Agusta and not even from Dunlop, I would say that Dunlop are ok with what Agusta is using them for.
Not sure if I have the drawing still or not. I asked Dunlop for it nearly 6 years ago when I first noticed the loads written on the tyres.