THANK YOU FOR POSTING THIS!!!
My wife gives me crap all the time for filling any empty space with gallon jugs of water. We had the breaker on the outlet the freezer was plugged into pop 2 summers ago and we lost everything in the deep freezer. Since then I've been putting gallon jugs of water in the freezer when ever there's space and have a small UPS system plugged into the same outlet so there's some type of alarm if the outlet breaker pops again.
I have been doing refrigeration my entire adult life. Brief adventures into other things but HVAC-R has always been the main career. I learned very long ago that a full freezer will maintain temp a lot longer than an empty one. The product holds the temp.
Not sure why anyone would give you crap about this but you are doing the right thing.