I have flagged a couple of answers that were duplicates of previous answers as 'very low quality' and the flags were deemed 'helpful' and the answers got deleted. However, some of the answers I flagged as 'very low quality' for the same reason, were 'disputed' or 'declined' and the answers did not get deleted. Those answers already had comments stating that they are duplicates (so the moderators or 10k+ rep users will know the reason behind the 'very low quality' flag).
I flagged those answers as per the FAQ on deletion:
Answers that do not fundamentally answer the question may be removed. This includes answers that are …
- exact duplicates of other answers
I had also flagged a couple of answers for being duplicates, that were 'disputed', but were still deleted. This made me think if I am using the 'very low quality' flag wrongly (that those answers shouldn't be flagged in the first place, or if I should be flagging as 'not an answer' or 'other').
Examples of answers I flagged as 'very low quality' that were deemed 'disputed' and did not get deleted:
Is there a Batcave in Arkham City?
How can I return to Skyrim after switching to Windows?
'Declined', and not deleted:
How can I increase Skyrim's Volume?