[gambiting]

On that page that you linked it literally says:

"The payment in cash between individuals (purchase of a car or a painting for example) is not limited. A writing is necessary beyond 1,500 € to prove the payments ."

In fact, even below it, where it mentions the 1000 euro limit for professional transactions:

"Note: this limit does not apply to people who have no other means of payment or no deposit account."

[forty]

Yes there are exceptions, but the general rule is that payment in cash are limited in amount. I was just illustrating parents comments that having cash payments limited in amount is not science fiction.