"The phrases which you have are simply encodings of the hashes of the passwords you used for the wallets. They are a password recovery tool, nothing more. "
exactly, i know that ..but i really cant understand why blockchain.info in they play fair and correctly and dont want scam his first members why the hell dont offer this "tool" , why they dont keep online this account recovery option - in my opinion in my case are for sure thousand of accounts with many thousands of btc on it!
when i put my mnemonic here site say invalid checksum exactly because
my mnemonic words are not in the standard wordlist, which is used now to generate now the private keys
In which case I'm afraid you are out of luck. The phrases which you have are simply encodings of the hashes of the passwords you used for the wallets. They are a password recovery tool, nothing more. If you do not have the wallet ID, an email address linked to the wallet, or the aes.json file backed up, then you have no way of accessing your old wallets.
You can try to keep harassing blockchain.com support about it (they are awful and will take weeks to respond), but it is unlikely they will be able to help if you can't provide any more details about the wallets in question.