The silly nerds -- or bots -- that run this over-automated site have not posted Bishop's poem, but Shelley's.
It's true that they're identical until the final few lines -- that's the joke, guys, and you've missed it completely.
But the Bishop version ends this way:

Look on my works, ye Mighty, and despair!"
Also the names of Emory P. Gray,

Mr. and Mrs. Dukes, and Oscar Baer

Of 17 West 4th St., Oyster Bay.