The rub two pearls together test, and the rub pearls on your teeth test, NEVER work for me, and I've handled lots of real and fake pearls. I can tell better by looking at the pearls themselves and also how they were strung.
These look like imitations to me. The surface color and texture look like imitation pearls. Real pearls would not be strung with gold seed beads as they turn real pearls black. If these were solid 18K gold beads, then real pearls would not discolor, but then the necklace would not be cheap because real gold is sky high in price right now. Plus, there's a cheap spring ring clasp.
An online thrift store is not a certified jeweler. They're probably using the words "akoya pearls" generically for these beads, instead of "these are real cultured akoya pearls."