Don't think of it as "sodium", think of it as Magnificent Mineral Salts. That's what he calls them on his website:
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https://www.medicalmedium.com/blog/celery-juice
Even if this guy made any sense, know-it-all Chantal is still gonna do the whole thing wrong anyway from the very first day, "improving" the recipe by adding lemon juice or pouring it in her oatmeal or something. (Dr. Quack, I mean Medical Medium Anthony William, emphasizes that the magical celery juice has to be pure and unadulterated with any other ingredient)
How anybody can be this dopey is something perhaps only a deathfatty can understand. I wonder if a blender fulla ground up celery tastes better than a blender full of rotten off-season grapes and lemon juice?
ETA: Here is a glimpse of the guru himself:
ETA II: Oh, and he also kinda killed a child...
https://www.inverse.com/article/40096-medical-medium-anthony-william