Sounds like a good product to add to the arsenal.
Edit.. I'm not sure I grasp how diacetyl and hop creep are related, or how stopping diacetyl will eliminate hop creep if you still have a fermentation kick up after dryhopping.
From the More Beer page on the product
"Although commonly added to heavily dry hopped beers, using ALDC during fermentation can benefit any beer style by reducing Diacetyl production. Brewing hops all contain the naturally occurring enzyme AMG or amyloglucosidase which breaks down long chain sugars into simple sugars that yeast can ferment. The reason hop creep is a relatively new phenomenon is due to the changing ways in which hops are dried and processed. As brewers started to demand more aromatics from their hops, growers began to lower the kilning temperatures to preserve volatile oils. This led to higher levels of AMG left on the hops as well, where they were previously denatured at the higher kilning temperatures. With more AMG present on the hops, dry hopping now leads to more fermentation activity and higher levels of Diacetyl produced after the primary fermentation is complete. Although the simplest remedy to hop creep is time—waiting for the yeast to naturally clean up the extra Diacetyl—ALDC is a great way to reduce conditioning time and the risk of off-flavors in your finished beer."
Alpha Acetolactate is a precursor to Diacetyl, the ALDC is an enzyme that breaks this up before it can be converted. what's not stated in above, is the short dry hop times we have adopted, and dumping yeast or otherwise removing the beer from the majority of the yeast cake before dry hopping make it more likely for diacetyl to show up. Low cell counts in the remaining beer and relatively inactive fermentation during hop creep mean that even with time, the yeast will have a hard time breaking down that diacetyl. This is why its often recommended to Krausen or otherwise add some actively fermenting wort to help clean up excessive diacetyl (it worked for me once).
There's no chance ALDC stops the actual creep because its not doing anything to the AMG noted above which is creating those fermentable sugars.