I really hate to be the one to tell you this, but they do send that to pretty much everyone who submits
Essentially, they publish probably 98% of the people who submit to them and then get you to buy the $80 book you were "chosen" to be published in
I really do hate to break it to you, cause poetry is cool and fun and all, but it'd suck to get suckered.
Of course, if you don't mind throwing away $80 to see your poem in print, there's nothing stopping you - but don't get your hopes up about any big prize or anything