We already have fruit picking robots and tilling robots and most modern farming is just somebody sitting on an automated combine. Japan imports a lot of food already. AFAIK (someone correct me if wrong) most of their farms are on the smaller side, are family owned, and subsidized by the government. It's not like the US with massive industrial farms employing waves of "migrants". And Japanese farmers certainly aren't asking for foreigners to stay forever.

Honestly I think the farming jobs ploy is a red herring. Notice they say "farming, food service, and other sectors". It's a completely meaningless statement.