I agree with Bri as well. I think the entire rule change eliminated the need to account for anything else other that the balance at the time. If you have a balance of $5,000 and terminate employment as of February first and are entitled to a Safe Harbor Nonelective contribution of $100 at year end, does that right to a contribution now mean your accrued benefit is $5,100? This is a rhetorical question but point out the potentially endless number of scenarios you can enter when you attempt to use anything other than the balance as of the date. It would then require and different procedure other than a simple analysis of the balance on the date of distribution.
I think the elimination of the rule in place years ago opened the door for you to simply administer the provision in the most simplistic method without having to perform the additional analysis of determining what the balance 'used to be' or 'will be'. The language in the plans that I've seen seems to be pretty consistent with this. I've yet to see language that suggest adjustments to the balance on the date.
Good Luck!