An interesting perspective, but it is taking a veryyyyy small amount of evidence and extrapolating to try and shut down what we understand through established medical science.
It's well known that we can regulate both our immune system and autonomic nervous system. Some meditators can regulate their ANS extremely well, and it's long been documented that mood has a massive impact on immune function.
What Mr Hofs research is lacking is a placebo group... with that his results might have held a lot more credibility.
I agree that more research should be done, if they want to make a scientific breakthrough. As far as mood is concerned - I went through a more recent study done by the same specialists.This experiment focused on the impact that "outcome expectancies" have on the end results.They measured optimism and neuroticism as variables.
The placebo group is an interesting proposal, but what the placebo should be?