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Maybe. One way I think of it is tapping into the phonological loop and repurposing that capacity for planning or meta-cognition. I recall one study where RAPM scores increased when people were encouraged to think aloud about the problems.
A study that says an intervention boosted IQs? What does the prior say about this being real. 
Doesn't have to be general. I wouldn't expect the phonological loop to help with reaction time, or crystallized knowledge like vocab. But it could help with some things involving manipulation of items in short-term or working memory (as RAPM stresses) by enabling 'chunking'.
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