What Geoff said. No one would doubt that LPs are prone to develop a static charge on their playing surface, and most good brushes are designed or make claims to avoid exacerbating the problem, but most brushes cannot eliminate the charge that may be induced by the simple act of pulling an LP out of its sleeve or your fingers touching it after you've walked across a wool carpet. For that we have devices like the Zerostat gun. The Mapleshade brush may or may not be able to drain off static charge via its ground wire. I've never tried it.
But none of this has anything whatever to do with magnetism or demagnetizing an LP, the need for which is still a controversial topic, at best.
But none of this has anything whatever to do with magnetism or demagnetizing an LP, the need for which is still a controversial topic, at best.