The pump used in the article is the compact 100 (300L/h), which is silent. The sound level of the higher performance pumps must be higher, but how high, if noticable at all is not mentioned in the article.
My guess is that the compact 1001 (600L/h) is close to if not completely silent, while the compact 1002 (1000L/h) makes a wee bit of noice. Though its only speculations, I have tried neither of the pumps... You might have to try googling a bit
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