In my experience, it's incredibly difficult to get a strong positive signal from a CV. You can definitely find red flags (my favorite example: people describing themselves as experts deep learning with 1 year of experience and zero publications) - but, after removing the obviously unqualified, the next steps have very low accuracy.
Honestly, it might have just been a sourcer/recruiter fuck up. If you can at all, ask a friend (or even a friend of a friend) if you can get an internal referal and bypass the broken resume filtering step.
Even worse, at some big companies, recruiters will ignore direct referrals and ask you to submit the resume internally through their req system. But then resumes get lost anyway.
Good recruiters accept internal referrals directly.
Honestly I dont that is true regarding CV, sure you can filter some extremely easily but its also pretty easy to see the good candidates even if there resume is terrible. Following up with a phone call will confirm it. And rarely result in an inept candidate. No offense to recruiters because they put in the work of sorting. But finding quality candidates to actually interview, those are easy to spot.
Honestly, it might have just been a sourcer/recruiter fuck up. If you can at all, ask a friend (or even a friend of a friend) if you can get an internal referal and bypass the broken resume filtering step.