You obviously missed the line in the opening paragraph:

"And UK campaigners warn that the UK could be flooded with “dirty meat” if a US trade deal is signed post-Brexit."

Actually the third paragraph, but never mind.

More Project Fear based on: UK campaigners warn that the UK could be flooded with “dirty meat” if a US trade deal is signed post-Brexit
We would only be 'flooded with dirty meat' if we were to accept it. A US/UK Trade Deal cannot force the country to accept, nor individuals to buy, such produce.