Some chicken slices have syns because they are processed with other ingredients - check the ingredients list.
According to the Tesco website, the ingredients are Chicken Breast (80%), Water,Starches (Potato, Rice, Tapioca),Stabilisers (Carrageenan, Diphosphates),Salt,Lactose,Milk Protein,Spirit Vinegar,Natural Flavouring,Caramelised Sugar Syrup,Rosemary Extract
so no, they wouldn't be free.
(Personally I have boycotted all BM products since 2007.)