Whats the chance?, page-237

No proof of 70 dB chip --> the company is lying

No proof they can manufacture in high quantities --> the company is lying

No proof they can manufacture in high yield --> the company is lying

No proof the chips won't fail --> the company is lying, or at the least incompetent

Your level of required proof is starting to sound like there is no level of proof that is acceptably trustworthy to you.
So why are you still claiming that you hold? Why on earth would you hold? I suggest you sell now, save your money, and come back and buy in on the remote possibility that they do, one day, manage to deliver on their promises. Maybe buy carrots instead.