No one has found, much interviewed this supposed Carlos. (inb4 "Kiev had him kidnapped and executed" or some other conspiracy theory)
As for the encoding timestamp, that's simple. It was re-encoded for streaming after it was uploaded, as Youtube typically does for most video formats. Primary Youtube servers are located in California, UTC-8. Ukraine is UTC+2, a difference of 10 hours. The encoding timestamp of 19:xx hours on Youtube servers corresponds to early morning in Ukraine the next day.
Are you Kremlin shills even trying? You need to work harder for your rubles.