The flight level of 295 in the Malacca Strait was reported early by sources such as Reuters. I'm posting one such article here though it is very old now.
Since there's been no confirmation, and since Daud retracted some of the statements attributed to him, this is possibly now one more item to move to the "unconfirmed" basket in this frustrating case.
UPDATE 1-Missing Malaysian plane last seen at Strait of Malacca-source | Reuters