The latest Atkins book lists unsweetened almond milk as acceptable in Induction, but as the Alpro product lists sugar in the ingredients (ahead of almonds, I might add!), I would think it isn't allowed.
If you're in a later phase, then I guess it's up to you whether to experiment with it. In general, we're always looking to avoid added sugars where we can.
I believe Tesco does an unsweetened almond milk, but I don't shop there, so I can't be sure.