The good stuff is in June when Boston College and other dorms move out for the year. The crap in Allston in September is from yearly tenants in off campus housing, was likely already second hand at least once, and is riddled with bugs. I guess Allston has gentrified, but I assume that just means the bed bugs now have credit cards too.
The weirdest thing about the original article is the author. Like yeah, you can get some great stuff in the trash. People value money wildly differently, and some people throw out practically new stuff. It boggles the mind. But it also boggles the mind that the author is still so focused on the retail prices of marked up "luxury" stuff, like they're still just solidly wed to the consumerist mindset. The used/dirty/soggy whatever can be fantastic, but it's certainly not worth anywhere close to its original retail price, especially accounting for your time to find, haul, clean, etc and how much comparable non-"luxury" brands would cost.
There is a Wikipedia article for the Allston (Boston) version: https://en.wikipedia.org/wiki/Moving_Day_(Boston)