VPS update are issued as required and in periods of high virus activity there can be multiple updates in a day, I think the highest was 5 in one day. Yes if there has been a false positive notification it would have to be corrected and this would usually be included in the next update, I'm not certain if a VPS update would be solely for correction of a false positive.
If you have had a false positive and excluded the file you should periodically check scan it and if it passes you can remove the exclusion.
