Depends what you understand by their strategy and what you mean by "correct". Correct for Sweden, or correct for other countries?
The Sweden strategy relies on population compliance. Firstly, what is correct for Sweden is not necessarily correct elsewhere - our population seems far less compliant, and is more densely populated.
Secondly, Sweden looks set to impose stricter measures this week anyway.
Personal view: The Sweden strategy has already failed. Compare where they are now vs adjacent Norway, which had more cases sooner, but responded much harder. They seem about to follow suit on cracking down, but have suffered many more deaths (Sweden has twice the population).