Concerning the virtue of one who dies whilst fasting, it was narrated that the Prophet (peace and blessings of be upon him) said: “Whoever says Laa ilaaha ill-Allah (there is no god but Allah), seeking the Face of Allah and that was his final action, will enter Paradise. Whoever fasts one day seeking the Face of Allah and that was his final action, will enter Paradise. Whoever gives charity seeking the Face of Allah and that was his final action will enter Paradise.” (Narrated by Imam Ahmad)
This promise is for one who is a true believer and does righteous deeds and that was his final deed, not simply for dying in Ramadan. Moreover, it does not mention that specific virtue of entering Paradise without being brought to account.