All of the English-speaking areas listed on that page use a period as a decimal separator.
Interestingly, Canada uses both characters as decimal separators, but English always uses a period, and French always uses a comma. That's probably also why Canada also uses a space as a thousands separator, not a comma like the US.
I see it as a feature of Euro English, like writing "XIV century" instead of "19th" or saying "actual" with the meaning of "current". Language change caused by an influx of non-native speakers is not a new thing for English.
