It's a pretty good guess tbh... At worst is October or similar but I expect later on the year but earlier enough so it's before the holidays but after they showed demos and games in summer conferences.
This assumes they have inside knowledge (which maybe they do), but they could also just be guessing, I think everyone thinks its going to release in sept-nov this year.
They're literally guessing btw, this is a full on nothing sandwich.
From the bottom of the article:
Update: Both Digital Trends and Bloomberg's Jason Schreier have now reported receiving statements from Altec Lansing that seem conflictingly to double down on the Fall 2024 date and also claim the date is "guesswork." What's likely happening here is that Altec Lansing was, in fact, making an educated guess on the date of the Switch's release based on internal industry conversations as well as analyst models. Whatever the case, we'll have to wait for Nintendo's official word to find out the real date.