The problem is, they are obviously just as good as the very best out there. Joke schedule or not, if they make the playoff, they are likely to be the odds on favorite to win it again without key injuries happening late in the season.
As someone else said, they are channelling 1990s Florida State. And while I always thought FSU was at a disadvantage come championship time due to the weak schedule (they only won 2 NCs during that long run of top 5 finishes), it actually helps Clemson today with the expanded schedule (as others have pointed out).
Having said all of that, you never know where a Virginia or NC State over FSU style upset may come from. It looks like a weak schedule on paper... maybe the ACC will surprise us. That's what I will pull for.