Ah you must be referring to this off the cuff comment by Robert Solow in a book review: "You can see the computer age everywhere but in the productivity statistics" (1987)
https://www.standupeconomist.com/pdf/misc/solow-computer-pro...
It's an interesting question and very much not resolved. It indeed led to a flurry of studies in the 1990s, and more recently to several updates and meta-analyses.
The problem of "does computer technology investment causes increased productivity" is an interesting issue in economics and statistics. It is far from clear that the (immense) investment in computers over the past several decades has caused a corresponding excess growth in productivity.
Some of the literature published after 2015 that I have read on this topic:
"Information technology (IT) productivity paradox in the 21st century"
> Thus we are still unable to confirm or reject the existence of an IT
productivity paradox
https://doi.org/10.1108/IJPPM-12-2012-0129
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"Benchmarking the IT productivity paradox: Recent evidence from the manufacturing sector"
(This one was published in 2006 but I find it relevant because it does a very well scoped analysis in manufacturing firms thus addressing the oft-mentioned argument that computer technology may leverage task productivity in a way that is hard to measure in aggregate)
> However, many scholars from both sides of the IT paradox debate agree that difficulty still exists in specifying how to assess the IT contribution, and the availability of reliable data sets
> Regardless of the final decision to differentiate or conform, our results make a compelling argument that more spending does not necessarily mean better IT productivity.
https://doi.org/10.1016/j.mcm.2004.12.012
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"Lessons from three decades of IT productivity research: towards a better understanding of IT‑induced productivity effects"
(This is one of the most inclined to disagree with the existence of the paradox, and still very cautious in the language used for writing the conclusion, e.g.:)
> But to not at least consider the ongoing technological change as an important determinant of the deceleration in productivity growth seems ill-advised."
https://doi.org/10.1007/s11301-019-00173-6
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The Productivity Paradox: A Meta-Analysis
(This I'm quoting from the submitted manuscript. I haven't gotten around to reading the published version yet, but:)
> Since the size of the effect helps make the right decision in business-related investments, our result of ICT elasticity being very close to zero with values, about 0.3% for productivity and no effect on profitability, supports the argument that there are better forms of investment to be made
https://doi.org/10.1016/j.infoecopol.2016.11.003