No, an abstention is a non vote. The distinction can be significant in a case where the percentage of those voting is critical (as often occurs in NSW).
For instance, if there are 10 people at a meeting, voting on a special resolution, the law says it can’t pass if more than 25 percent of those voting vote against. If 8 vote yes, two vote no, it passes. If 7 vote yes and three vote no, it fails. If 7 vote yes and two vote no and 1 abstains, the vote against is 2 out of 9 against, or 22 per cent so the motion passes.
An abstention is a non vote, not a no vote.