How?
In his video all he showed was that people were trying to pay him through a paypal button linked to his wifes email. Thats why his wife is getting the unclaimed funds notices.
If you watch on a laptop/pc you can clearly read the subject lines and contact's on the emails and you see real people trying to contact the business about their orders.
He says to his knowledge paypal hasnt been a payment option on his site for years, and that they recently added a button after all of this started as a test.
So its simple to figure out...go back to the unclaimed funds notices in the emails. Ask those people what site they paid through...and then you found out where your problem started.
Most likely that button has been there all along, and whoever manages the website didnt know.
As far as what caused his bank accounts to get frozen