yes this is lacto-_ass_illus fermentation style. The anerobic environment allows for the production of _ass_etic _ass_id and lactic _ass_id which gives you that familiar tanginess.
Ime, people who are curious about anal and want to try putting something up their butt aren't big enough to take cucumbers (or at least they think so, you're stretchier than you realize), and people who can take larger stuff have actual toys that are better in every way. Although, as improv dildos, they're actually not bad imo. Better than most everything else I tried when I was a curious butt noob