Are those 5k-10k words completely new, or are document templates part of this count?
I know from experience (of on-line commenting; don't judge) this word count is entirely possible to achieve, but I can't imagine sustaining it long-term, as a part of a job.
I think the point here was that the ghostwriting is of really low quality. Overnight 10k reports are never groundbreaking or enlightening additions to human knowledge, but they need to be 90%+ accurate and polished enough to inform.