Yep, perfect sense.
So basically, the trainer's saying they're going back to ground zero and treating this horse as if he's never been under saddle in his life. A lot of trainers do this, and I like it.
It 'unteaches' the horse any bad habits he may have picked up, as well as setting down a good foundation of ground work before there's any under saddle training done.
I don't know your trainer, but I'm impressed. They certainly seem to know what they're doing.
Good luck with your horse. I'm sure once the kinks are worked out, you two are going to make a fine team.