Short Answer: No
Long Answer: There is no way to revert updates in steam if they are pushed in the MAIN branch.
D:OS is still gonna get a lot of updates until release, which is on the 30th.... and 11 days is still a lot of days to push out updates, or do you want to download 1gb of updates on release day?

Remember, this is normal for early access... shortly before release you often see dozens of updates pushed over steam as this is the point in time where every bug and issue not patched could destroy review scores.
PS.: IF you ever want to make sure steam does not update something you have to start it in Offline mode. Only way I know to be 100% sure that it does not override your settings.