I agree that "puritanical" isn't appropriate for Swedish Lutheranism, but I suspect the previous poster was using "puritanical" more loosely, as a rough antonym to "hedonistic" and not as a specific religious movement or influence.
I'm not sure though about your statement "mostly advocated alcohol use in moderation."
There was the Swedish prohibition referendum in 1922. Just under 50% of the voters wanted an absolute prohibition on "rusdrycker". That includes spirits, wine, and strong beer. The referendum was "För eller mot införande av fullständigt rusdrycksförbud" - "for or against the introduction of the complete prohibition of intoxicating drinks."
(I'm uncertain how to translate 'rusdryck.' I think 'intoxicating drinks' is best, vs. "drinks with alcohol." A rusdryck is currently defined in Sweden (since 1944) as drinks with at least 2.25% alcohol by volume. I don't know what it meant in 1922. IOGT put it at 2% back in the late 1880.
For comparison, in the US the 1919 Volstead Act set the limit as 0.5%, while the 1933 Cullen-Harrison Act raised it to 3.2% by weight (=4% by volume), just a few months before the amendment overturning Prohibition. For that short time, US prohibition laws were less strict than what Sweden would have had.)
In any case, I don't think it's the same as saying that the temperance movements advocated for "alcohol use in moderation." Most of the temperance movements seem to have been for the ban, and relatively fewer temperance organizations (like the "Landsföreningen för folknykterhet utan förbud" - "National Association of Public Temperance Without Prohibition") against it.
As for the Christian influence, from what I can tell, while there were Christian organization in the early 1800s which advocated less alcohol use, it wasn't until the the "new" temperance movements of the late 1800s, with strong US influences, that people advocated for a complete ban. Some, like NGTO, were more specifically Christian than others. I think the modern IOGT-NTO is not Christian, though there are still Christian-based temperance movements in Sweden. As I recall, most people in the more religious area of Sweden voted for the ban, but that could also be an agriculture/small-town vs. industrial/big-city divide.
The modern temperance movement is, as you say, not the same as 100 years ago. IOGT-NTO advocates for reduced use of alcohol, and for the existence of alcohol-free places (like meeting halls). It does not advocate for the ban of alcohol.
