Zak is a loon. He runs for fun over 10k feet and look where he lives. You can't possibly trust anything he has to say.
But seriously, Redwood and Pinehurst were really heavily patrolled the last I knew, and Marsh Creek has a lot of traffic and really isn't much fun IMO and Ignacio Valley is akin to driving in LA traffic.
In terms of the peninsula, if you avoid the "popular" roads like 92, 84, 9, and certainly 35, there are still more roads than you can count where there will be minimal if any traffic no matter the season or day of the week.