Since there are only two of us in our team, and we are both on public record tens of times as saying that it's perfectly fine to do this, you can feel free to just go ahead and ship otf/ttf files with your game. And anyone who wants 100% peace of mind / concrete legal evidence can ask us for a signed letter saying so.
I will look into clarifying the wording in the license, there is clearly a balance to be struck to protect both our rights & our user's rights, but we have been letting people ship otf/ttfs with their games for 10 years now so I hope that gives you some trust in us in the mean time.