Swallowing magnets like that isn’t anything like swallowing pennies.
Those powerful little magnets get into your gut, without medical attention, you will die.
If a few find their way into your intestines, the magnets will stick to each other, tie loops together, and you will kill portions of your intestines. It is a nasty way to die. The blood flow will get cut off to loops of bowel, which will die and become necrotic.
Or so I am told.
Yes, it has happened..............
You could swallow one and get away with it as long as there isn’t something ferrous inside you already. You could swallow two of them if you swallow them together because they will stick together and become one bigger magnet. Did you know that every Chromebook has one in the front bezel of the screen? I worked on Chromebooks quite a bit over several years and ended up with about a thousand of them. They are very small but if kids knew they were there it would be a huge problem. They are how the Chromebooks know the lid is shut. Our schools have as many as three Chromebooks for every student because they break down so easily and often that some kids go through several each year. Then they go obsolete after 5 years.