Yes, because even if the file is decrypted, there should be extra seed words to add more entropy(?). This is why I said about there being a small seed phrase needed to select the proper seed phrase. Even without adding extra words, there is [12!] or [24!] possible combinations, and thus numbering the seed words is also important data. In reality, you're storing a two dimensional array. One column is the seed number, and the other is the seed words. Each row has a seed word and the number the corresponds to it's order in the sequence.

TL;DR encrypted padding data to hide the real data is good. 👍