I don't think you can take much from the last transmission, as they said it was the last words, for all we know they may have acknowledged a frequency transfer and used correct terminology. ATC then have added at the end something they forgot to mention, like logon to CPDLC with VVTS. I think we are all guilty at 2 am of making a less stringent call to ATC with correct terminology. Nothing out of the ordinary at all, having said that it would be nice to know the full transcript.