I'm not sure you can draw any conclusions from that. It's available as a bulk product for cheap everywhere, maybe it's become unprofitable for a pharma company to produce a product that is now widely available cheaply (same reason why pharma companies want their drugs not to become generic right away).
Anyway, personal experience in progress. 34 y/o male, bodybuilding since 17, did several cycles of gear (test/dbol/deca, test/eq, oxandrolone, etc.) up until age 25, spent too much time on a test enanthate/turinabol cycle my last cycle, did OTC supplement pct (bad idea) instead of usual clomid/nolva/liquidex and wound up with low test levels in the 390 range tested finally at age 28 (yeah suppressed that long).
I think I've had low test for years and I've tried a lot of different things to try to fix it (considering TRT in the future). Haven't got my levels tested recently, but I've tried TA 100 up to 800mg/day, boron, ZMA, etc. TA helped a bit, but not substantially.
Started DAA for the first time 3 days ago at 3g/day, and I notice a pretty significant difference thus far. I've woken up with wood the last 2 nights, my facial hair growth is noticeably thicker, and I just feel much better overall with less p.m. fatigue, feeling "hotter," temp wise, increased sense of well being, and far less irritability, as well as better muscle fullness and increased libido.
As far as I'm concerned, this stuff does something that feels like increased testosterone to me, and it does it better than Longjack, boron, ZMA, Nettle, and anything else I've tried. I finally feel more normal.
I've read that it tends to work better longer term for people with decreased test than for people with normal test (who get a short boost that returns to baseline), so I'm hopeful that it will be effective for me. Regardless the difference has been enough to reaffirm to me that I likely have chronic low T and if DAA doesn't work long-term I'll have to think about TRT or perhaps HCG/clomid therapy first through an endo.
Anyway, TLDR, I don't think DAA should be dismissed as ineffective. It's definitely doing something significant for me and a lot of reviews on Amazon say the same thing. I know it's trendy to diss the supp now (posts I'm reading from 2010ish era are largely praiseworthy), but I think there is something to it, so far at least.