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Here's what I vaguely remember; your skin carries a faint electrostatic charge which literally pulls the drops of perspiration out of the sweat glands at your pits. Anti-perspirant, which includes aluminum, disrupts the charge and thus the perspiration isn't drawn out.
If you use this stuff excessively, it's possible that the pore will get clogged enough to get infected, and then you get a nasty boil right in the armpit. That's not happening to most people, but if you're somebody who baths only occasionally and uses anti-perspirant to compensate, you can get in trouble. A physician assistant I knew once, who'd spent most of his career in the Army called it "GI Armpit."
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