This is disingenuous. They're comparing the entire entertainment industry to the manufacturing portion of the agriculture industry. If you include agriculture's entire impact after the manufacturing step, you'll find the retail and food services industry that arise from it contribute $5.75 trillion to the economy. [1] That dwarfs the arts and entertainment industries by several times.
And if you are going to add the entire food chain to agriculture then we will add the telcos and consumer electronics industries that depend on content consumption and the tertiary industries like advertising and marketing that draft off the economic engine of content delivery. I think that in the end it is going to be the case that arts and entertainment have a far larger footprint than food over the past few decades.
[1] https://www.statista.com/statistics/197569/annual-retail-and...