Note: i have no idea if the $45 is realistic, but the principle is there - much of the production cost of meat is payed by the state. The price of meat would increase if this practice stopped because without any increase in profits.
But despite their opinion, no, it isn't that expensive. That sort of analysis heavily relies on telling you what you want to hear, and expecting that you won't dig into the analysis and realize that if you applied the same standard to everything else in the world you'd get absurd results all over the place.
Edit: OP clarified with a source below that it would be closer to $15
Related would be the conflicting effects on supply of less economies of scale vs being able to utilize only the most efficient means for production (e.g., only the places most fit for it would be producing cattle, meaning that the marginal cost would be lower than in the previously utilized high cost areas, although this wouldn't be sufficient to counteract the original shock, it might help balance the other effects.)