No, I'm saying it's completely useless against some systems. depends on the mechanics. If OPM lacks anything even close to it, then unfortunately, that very well might be the case.
To elaborate, when they said universal energy (they didn't even say systems, they said flow of energies), they meant things like, gravity, temperature like heat, fission and fusion, kinetic, thermodynamics, quantum stuff, etc. You know, types of energy that exist within the universe? When they said that they didn't mean what you think they meant.
So yes. It actually is completely useless in some, but not all, cases, don't expect Garou to be copying exotic supernatural powers, energy, powers and abilities that can't be replicated via his stuff, etc. Of course, he could replicate some abilities through means he CAN manipulate, even if he can't manipulate the mechanics. Like yeah, he ain't copying fire magic, but he sure as hell can replicate the fire the spell casts. But that obviously has limits to again, being things that his powers would cover, he ain't replicating or mimicking wacky concept hax for example no matter how hard he tries to pseudo science his way to victory.
So yeah magic is a def nope, at least mechanically, he could copy the lava effects and what not, but the funny soul and life hax or the magic on a mechanical scale? Nah.