Your embassy understood the question.
When you apply for a short term visa (or the effective equivalent on entry to a country), one of the most important questions the official has to answer is "Is this person likely to leave the country at the end of the trip, or do they have any reason to overstay". By applying for a residence permit you have told Sweden ...
This is risky at best. With visa-free entry, you would have the same status as a Visitor. As such, you would be permitted to undertake certain academic activities, including:
going to a conference, meeting or training
doing academic research
accompanying students on a study abroad programme
You wouldn't, however, be permitted to "study". If your on-...