It seems like pretty much all the band members except for Rob has denied the fact that the band would be splitting. My guess is that Rob wants a little break from it all, and in that sense he felt frustrated when people kept coming to Knife Party concerts with Pendulum-stuff to sign and wanting to talk about the band.
Good news. Hopefully Rob can say something about it soon as well, I really don't want Pendulum to split up. Immersion had tons of variety, and it felt like they were bringing Pendulum into a direction where they could do whatever they wanted to, and it's not like Hold Your Colour (which is still amazing) that had more of a "one style"-direction. (It's still tied with Immersion for me though)
I do think the whole "hinting about breakup" is such a dick thing to do. I remember back when there was rumours about Oceansize (before they announced the split up) and it was like a 3 week long nightmare before anything was actually announced. A video on their website with "Superman retires" and shit like that, and I honestly hope I will never have to endure something similar again.
But yeah, Rob shouldn't be offended if people wants to talk about Pendulum, it's fans after all, people who love his work.