Learn what "they're very secretive and unproven in their work" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the people are hard to trust and have not proven themselves professionally.
From The Escort, Episode 25
Someone is giving a negative evaluation of another group's work and reliability.
Use this in work discussions when criticizing someone's credibility, though it can sound harsh or judgmental.
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