No that is not correct, here is the thing, given a ciphertext say
ezcle, there exists a key such that this would decrypt to
hello, another key such that this decrypts to
harry, another key which will decrypt to
frank, another key which will result in
world. And every other 5 letter word in the dictionary, and every other 5 letter combination of letters (I'm restricting to letters to make things simple).
Sure there are a lot of outputs that are garbage, but there are a lot of outputs that are not garbage, but every 5 letter word in the dictionary will also appear. Thus, before doing this cryptanalysis, you had a pretty good idea that the ciphertext encrypted a 5 letter english word say. After your cryptanalysis, you have not eliminated a single 5 letter word from the possible plaintexts. Thus you have gained no extra information by doing the cryptanalysis.