I don't think a big pile of spuds, veg and chicken is feeding the birds!
Council will not want to know if it's his back garden - if he dumped it in the front then they might get involved.
He sounds like my old next door neighbour who was quite sly and canny about treating her back garden like a toilet to annoy us but knew exactly what not to do out the front which could have attracted attention/sanction from guards/council etc.
Food deposits in a garden gives food back to a garden.