I have a hard time wrapping my head around this.
Wind is indeed a heat killer, but that's what temp controllers are for. I too have a Traeger Jr with the back vents, and have experienced 2 flame outs. Both were induced by the pellets funneling out in the hopper on overnighters.
I can't speak for the rec tec version, but it seems highly unlikely for the wind to cause a flame out. In my case:
The heat deflector covers the firepot on 2 sides and the top. The open back is 3/4-1 inch from the sidewall, and the front is full open.
The pit runs with a fan, so the ID of the pit is energized with air pushing it out of the open end of the heat deflector and to the exhaust ports.
The drip pan covers 95% of the area inside the pit above the firepot.
I simply can't imagine what kind of wind could overcome all those obstacles and cause a flameout. Were it that bad, I'd be seeking higher ground.