A win's a win. Plenty of mistakes were made on the SU's part to enable your survival, but i'll try to focus on nitpicking your play. Maybe you can find something to learn from my babbling.
Okay, that flank was not how I typically approach the dunes with that lineup, but I can see why you'd do that, given the heavy/TD setup. I'm more apt to take C, or cross it, poke out then back into cover to check for the bulb to go off or not. If safe, repeat towards the gully unless you can setup reliable shots to town from dunes. Following that, I'd also take the far edge of map but under more favorable hard cover.
Once you cross the gully and start trying to pelt the French TD, you were doing just fine other than one little nitpick: The lack of cover near possible sniper nests should have cautioned you about the open deadzone, and that's how the SU got his initial shot off. Wasn't looking too closely, but I believe it was unspotted up until your bulb lit up at 1:37 +/-1 second. Let's move to a more of a play by play following that.
Taking that initial big hit, you immediately stop to zoom, fire, then begin trying to back up. That's a bit slow IMO, but you did well to realize the lack of hard cover and slow backpedal, then immediately pulled a forward hard left after that. If you are aware of your positioning and terrain, you can start taking more chances at driving and firing to minimize your exposure time. Firing as you're diving for cover is more often about trying to lay down suppression fire and caution reds against gunning for extra hits as you retreat. Any actual connected shots are icing on the cake of your survival. Eat up once you're behind hard cover or out of range.
After you ran away, he could have immediately ignored you and ran to assist his allies rather than chase you down, a mistake on his part i'd say. Anyways, you pulled a gun from your allies and that's a good thing team-wise, not so much for you since you're focused by a punchy gun at this point. The thing that bugs me is that you didn't capitalize on the fact that he drove past you when he went into the gully. If you'd pushed towards his flank/rear rather than continue backing up behind the rock, you could have effectively stayed behind his gun, away from the bad end of the boom stick altogether and could likely have removed him in about half a minute or sooner. A conservative play, but you need to be aware that such cautious play eats up a lot of time unless you can setup damaging/kill/crippling shots to remove them from the fight and let you move on to other targets. This gave the Frenchy enough time to bail on the heavy front (roughly 2:40-2:45), double back, and eventually come up on your rear. There was one other opportunity to get behind his gun at 2:30-2:35 but was much riskier since he'd already initiated his turn and you may or may not have had enough acceleration to lock his rotation by sidling up next to him.
After that, you made the most of a bad situation, taking out the French TD when you saw him. If the SU were closer and more proactive in pushing as the french TD did likewise towards your rear, he could have taken you out when you ignored him. Peekabooming around the rock is exactly what you should do since they have two places to aim for: left or right. If you keep them guessing and if you know where his gun is pointed, you are perfectly safe to poke and fire at weakspots.
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