The guy's research is full of unjustified, pulled out of the ass assumptions as:
"We assume the frequency is limited by the Planck length lp, which is to say that we assume no wavelength can be shorter than the Planck length."
"Haug suggests that there are good reasons to assume that the Planck mass will dissolve into energy within a Planck second."
He doesn't offer any theory behind his assumptions, no experimental tests for them, nothing. It's just speculation which people do over a pint of beer in a pub. But it gets published in, har har har, peer reviewed journals. And cited by Forbes. I'll go shoot myself.