What happened there?

What that post was supposed to say was that a million dead (British and Commonwealth) is most definitely "MANY", especially when compared with much smaller death tolls over which a great deal of fuss has been made more recently.

And as far as Spanish Flu is concerned, maybe those deaths should be added in as well. For, according to Wikipedia:

"Investigative work by a British team led by virologist John Oxford of St Bartholomew's Hospital and the Royal London Hospital identified a major troop staging and hospital camp in Étaples, France, as almost certainly being the center of the 1918 flu pandemic. A significant precursor virus, harbored in birds, mutated to pigs that were kept near the front."

Cue Keith and Teribus searching for a reason as to why Professor John Oxford's research should be considered as discredited.