So my brother who's pretty inexperienced brined his ribs, smoked them for an hour, put it back in the brine/fridge, and plans on sous vide+searing them. Is there danger in putting the cooked pork back in the brine if he uses sous vide? I told him how unnecessary his steps/processes were, but he's stubborn. I ask this bc I worry for his health.
There is no problem with the brine, smoke, sous vide process as long as he pays attention to typical/safe temperatures. I would sous vide then smoke and probably return to a hot grill, rather than sear, but that is personal preference. What would be unusual would be a return to the brine after the smoking. While it could be made safe from a food-safety standpoint (new brine...well-chilled...), I don't think that would be desirable or all that beneficial. Have him take a look here for detailed tips: https://www.chefsteps.com/classes/barbecue/#/dry-style-baby-back-ribs