HV low-frequency differential oscilloscope probe

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I saw this homemade 100X differential probe on you tube. The circuit uses opamps with unity gain placed after a resistor divider network. Looks interesting. It has a more than sufficient bandwidth of 800Khz. Good enough for PI. Maybe a differential probe is not required and just a regular 100X single ended probe is sufficient. But it is still good to know.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiX7tD7vZPmAhUliOAKHeNbD7sQuAIwAHoECAMQAw&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D_OZ5Xer84eo&usg=AOvVaw1RR99j21w9Gt90bmtKD9vO