The purpose of science is not prediction. The purpose of science is to find better deeper explanations for reality.

The key to the experiment was this: "Initial studies at the time seemed to suggest psychedelic drugs that activate 5-hydroxytryptamine 2A (5-HT2A) receptors could significantly reduce headache burden in chronic migraine sufferers."

We still need to do more studies and experiments and change our explanations to test those new explanations. That's all they've said. And here the initial comment was just going to cancel it outright because, probably, it didn't fit their internalized cultural moral landscape.

The experiment in question was testing an explanation, there is a HUGE lack of understanding of things that are banned, like Psilocybin--because they are banned.

See also: The Fabric of Reality by David Deutsch