Again, I think you're giving the author the benefit of the doubt when it's not warranted. Your paraphrasing "science itself is insufficient to understand the world" is code for dualism.

I forgot to add the reference in the comment above but tacit means what I said it meant. I quoted directly from Wiktionary [1]. I'll do so again here:

    Adjective
      tacit (comparative more tacit, superlative most tacit)
        1. Expressed in silence; implied, but not made explicit; silent. 
           tacit consent : consent by silence, or by not raising an objection
        2. (logic) Not derived from formal principles of reasoning; based on
           induction rather than deduction.

I chose the "logic" interpretation as it seemed the most appropriate given the context.

[1] https://en.wiktionary.org/wiki/tacit