If this is dedicated for use at your house, lift the bonding jumper. I am sure the procedure is in your owner book and that is part of the listing so it should not affect the warranty. Not bonding the generator to the GEC is a worse infraction than paralleling the neutral if you decide not to lift the jumper.
This is an issue of Separately Derived System and whether you are switching the neutral. In a similar situation, I am just living with the parallel neutral since I use this genset stand alone sometime.
