Phase angle/power factor correction has been a long running scam. They sell gizmos on Amazon that do the same thing in a household. Some folks, maybe even the guy you're talking about, become duped by the scam. I know a guy who handed thousands over to some scammers saying they had one of those perpetual motion machines made with permanent magnets, just needed a little more work and it was going to "break unity," be over 100% efficient in power in vs power out. When I told him about the first law of thermodynamics, and that it wasn't a theory, he just wouldn't accept it. Lost his money, too.
When utilities/distribution companies want to correct a power factor, they'll place a passive capacitor bank in a switchyard/substation. It isn't hard, and surely isn't a "100 year old problem believed to be unsolvable." They've been doing it for decades. They only do that when there are voltage issues at that particular node. If it's caused by one large customer, they'll make that customer pay for it.
What this company did was fabricate up a fairy tale that they could save folks money on their electricity bill. They make a demo unit and show amps going down when they turn their gizmo on. What they don't tell you is what that youtube video I posted told you, you don't pay for amps, you pay for watts (kilo-watt-hours, specifically), and PAS does absolutely nothing for watts, it can't.
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