There's no denying that this is a little bit of a strange situation. Matt Hardy posted the above video and comment after a taping of Impact, that was filmed a month ago, aired on POP TV. His comment obviously implies that he sustained career altering injuries and won't be able to continue as an active wrestler.
Here's the strange part. He's wrestled since that taping, at a WrestleCon event during WrestleMania weekend.
What does that mean? This isn't a real retirement or career ending injury, but a means to develop his storyline with his brother Jeff.