I guess the real questions are whether the review process is faster than writing a manual summary and whether there would be a scenario where manual review is neglected in the future.
And how in Hell's name do you propose they actually check these reports? Sure, it's bloody obvious if the report claims some fantastical event that clearly didn't happen. But what if the LLM spits out a reasonable-sounding, but completely fake summary? We're talking about automatic video summaries here. The only way to correct them would be to manually watch through all the video yourself and to compare it to the AI-generated reports. Simply spot checking will not work, as the errors are random and can appear anywhere. And if you have to manually watch all the video anyway, there's not much point in bothering with the LLM, is there?
These systems only have the potential to save time if you're content with shit-tier work.