It's highly unlikely Access is going to honor flock, but you're definitely welcome to try. And if it doesn't then you don't really gain anything by trying to lock it as it's free to ignore it, hence "advisory locking".

Think of it as a "Wet Paint" sign on a bench. The sign itself just tells you, "Hey, sit here and you're going to get covered in paint." You're not prevented from sitting and getting paint on your tuckus, but if you ignore the advisory bad things can happen. Access, more than likely, is going to blithely sit on your freshly painted bench.