Eratosphere does have a high profile, generally considered the top forum for formal poetry so of course editors who publish formal poetry are not only going to google but they may well be members of Erato and read your poem here anyway.
The easiest solution is to keep some poems for submitting to magazines and ezines and some for posting to Erato and other poetry forums you may belong to.
Personally I think if you submit a poem for publication and they request that the poem not have been posted anywhere else then you should be honest and abide by that requirement.
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