No many.
But you left out:
How many dies in horse accidents (even today, horse riding is more dangerous than motorcycle riding).
How man died in boating accidents (common form of transportation, no personal flotation devices required.)
How many died in accidents otherwise? No guards on machinery, no safety standards, just personal prudence.
How many died of poison? easy access to poisons, Mercury, Arsenic, used as medicine.
Are you really going to argue horse accidents over autos? Boating? How many people in England set foot on a boat back then? I’d wager the vast majority stayed damn close to home their entire lives. And a much higher percentage of people lived in rural areas compared to today.
The line that read “… the incidence of degenerative disease was 10% of ours.” is suspect too. Alzheimer’s wasn’t even diagnosed until around 1900.