I can see why you would think so, but it doesn't happen. Firstly, Campag has a bit of a design flaw in that if you inject fresh grease through the grease ports on the Record hubs, the old grease comes out both sides. On the left, you can just wipe it off. On the right, it injects straight into the freehub, instantly silencing it. My Campag wheel has done 200 000 kms with that treatment and never missed a single engagement. Further, I've greased hundreds of customer freehubs on request to silence them and again, no problems. Light lithium grease just don't interfere with the pawls. In fact, Hope pawls have strong springs (which break easily) that quickly overcomes the grease's silencing capability.