I think this can be a huge help with some dogs. Many times, the dogs are brought into the trainer's home so they can work with them around the clock.
But it's equally important that you and your husband, as his human caretakers, are also trained upon his return.
There are many things we can let our small dogs get away with that become big, big issues when the dog is much larger. And we don't even think about it because we're experienced with having small dogs in our home, and that's how we've always treated them. So what if our actions and excitement get them ramped up and they jump on people? They're only 10 or 15 lbs. The worst thing that will happen is someone's legs get scratched or their slacks get a snag or two from an excited dog's nails... but when a dog is nearly 10x that weight? It's a big problem.
But you should be prepared to have to change your mindset and actions toward your dog. I can empathize with your feelings of missing him, and that he's a valued member of your family. But sometimes, our empathy and love can create and/or prolong behavior problems in these big dogs. And when a trainer tells you that, it can feel like a personal attack or condemnation. But if you love your dog and want him to be a peaceful part of your family and a responsible canine citizen when he's out in the world, you'll need to work through it even if you feel that way.
It sounds like you've made a good choice for your dog, even if it's sad for you as a family. It's only two weeks, though, and not the eight to twelve weeks that I've had friends experience with hunting dogs who are sent away to be trained for specific work. So that's good! I can only encourage you to get your husband fully on board with the changes you two will have to make when your furry one comes back home.