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You’re both wrong.
They are wrong because GSC is useful for informing trends and issues with your site.
You are wrong because GSC is a poor measure of actual traffic and site analytics. You should use GA for that.
You also have to realize that GSC is not real data, it’s sampled. Rankings are average rankings and not localized. Keyword data is also based on every keyword a site ranks for, even the ones that don’t matter. You should be using Semrush or Ahref, or whatever service you prefer to track important keywords by location.
Fire these guys and hire a reputable company, then listen to them.
