They stock plenty of third party Wine in my area, although the beer is all Trader Joe labeled. There are a handful of other things that aren't Trader Joe store brand or completely generic (yet?).

Not that it would matter here, the law in question sets the market cap miles above where Trader Joe's is.

I had forgotten about the beer/wine, as the one I've been going to doesn't have that section. With the alcohol oligopoly it makes sense they can't make house brands so easily.

They absolutely sell other brands, my local TJs has a huge stack of White Claw in the beer aisle.

There are a handful of non TJs brand items. Not many, but some.