No, it doesn't advance the plot in any meaningful way. True, Filoni might re-visit elements of this episode just as he did in the whale episode of Rebels, as mentioned above by someone. But, until that happens, this episode was more filler than anything else.
1. We knew Mando was a wanted criminal by the Imperial Remnant after Moff Gideon's episode last season. We also knew the Republic wanted him, and if we didn't know that for sure, we had a pretty good idea after he was a party to the murder of New Republic soldiers while helping with a prison ship breakout last season. That was when Bill Burr guest starred. Guess who else guest starred in that episode...Dave Filoni as an X-Wing pilot. Guess who guest starred as an X-Wing pilot this episode...Dave Filoni.
2. We already knew sub-light travel existed. Remember, in The Empire Strikes Back the Millennium Falcon's hyper drive was damaged and they had to limp to Bespin from the Noad system after dodging the Imperial Fleet. Guess who followed them at sub-light speed....Slave I and Boba Fett.
3. I don't know that the New Republic pilots not helping fix the ship was all that important, outside of tying up this episode with a nice bow.
Speaking of Boba Fett, wouldn't it have been amazing to see him step out from behind the rocks after Mando was thrown from his speeder? I thought for sure after those three slapdicks dismounted him and were killed by Mando, that the Fett Man would walk out from behind a rock. Too bad we didn't get that.
Still fun to watch the show, this was just a sub-standard episode. Especially after last week's outstanding season premiere.