The framing was slightly glib, and you're correct that current rates impacts the equation, but there has been real damage caused by how extremely attractive this strategy has been over the past decade. We sitting on an unprecedented peace time deficit due to a failure to properly tax an economy that has been massively prosperous during this same period. This strategy is small part of it, but it is a real part.

It wasn't extremely attractive if you actually think it through. e.g. if rates are lower and you're willing to carry investments with leverage (that's the idea, right? Your investments will grow faster than interest?), why aren't you already leveraged up to your risk tolerance? I don't think there's actually a world where this plan works. It seems like this is a reddit meme for people who have never actually considered a securities loan.