there's three things wrong with this.
1) they give you spinach and carrots at the same time. so, you don't know what is what. when compared to the previous study, beta-carotene in cooked spinach is less degraded than it is in carrots. so, the spinach is going to ruin everything, if you're concerned about carrots.
2) they chop and heat at the same time, so you don't know if the benefit is from heating or chopping.
3) they're measuring a weird isomer of beta-carotene, on top of it.
frankly, this is the kind of study that looks like it was funded by a bottling company.