Piànzi rúfǎpáozhì, jiēlián piàn le hǎojǐ gè lǎorén.
The scammer used the same playbook and cheated several elderly victims in a row.
Tips
history
From the Qing novel 《镜花缘》 by Li Ruzhen: "即如法炮制,果然把阵破了" - they carried out the method and indeed broke the formation. 炮制 is the traditional Chinese-medicine term for processing herbs by roasting - hence "follow the recipe as prescribed."
mistakes
炮 here reads páo, not pào. It refers to medicinal roasting/processing, not cannons. A very common mistake among native speakers too.