It was an over-exaggerated figure in a headline in a provincial paper, just written for effect. Putting the weasel word 'could' in there means absolutely nothing substantial.
He is undoubtedly concerned about shipping cost rises and delays and presumably is against Brexit, but the shipping company boss is not working in the field of white goods or staple foods. His business forms just part of the costs of those goods. I know we will be facing price hikes, but when Samsung tell me I will be facing 300% price hikes for my fridge I will really worry.
Brexit will be bad enough without resorting to hyperbole.