Syn value - pre cooked chicken

hi hope you can help! I was working out the sun value at 1 sun to 20 calls but read somewhere that when it's a food that would normally be free (chicken) there is a different way to work it out but I don't know what!

The product is sweet chili chicken bites from Lidl
Calories 150 per 100g so I was working out at 8 syns - is this correct?
Thanks in advance!
 
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