As others have said, he for whatever reason had a completely lazy setup for someone who develops for Bitcoin Core. He doesn't even use a hardware wallet or use a separate computer for his BTC bag or other sensitive data.
That's not how it works at all. "Bitcoin" is just a unit of measure, except for the brief moment of mining a new one. Would you be less paranoid if your savings were denominated in pennies vs dollars?
Plenty of "normal people" use combinations of physical security to protect their assets. Safes, deposit boxes, tamper proof materials etc.