How on earth is it free???

Tesco simply lamb shank with mint gravy?!?!?! The book and website says free on EE but before I cooked it the fat was clearly visible. If I'd cooked it myself it would have been syn'd I just don't understand. Please help.
Nutrition info on box...per 270g serving

515 kcal
58.1 protein
10g carbs
26.2g fat
2.2g fibre
 
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