SHarris Based on the details provided, you won that point fair and square. In padel, the second the ball clears the back wall, the point ends - regardless of out-of-court rules.
The situation you described was an x3 shot that went over the back wall in the air off your block. At that instant, you'd already technically won the point, even if out-of-court play was permitted in your match.
For clarity - in a match allowing out-of-court returns, if your x3 went into the net first and then the ball bounced twice out-of-bounds, your opponents would have got the point. But on an aerial back wall shot like you executed, the result stands as soon as it passes that rear plane. Well struck!
So while the out-of-play guidelines matter on some close calls, on back wall winners like the shot in question, the point outcome is clear - your excellent blocking touch earned the tally either way. Nicely done closing out the point!