Obviously not a shell. A shell does not vigorously defend 2 law suits for years at considerable expense, win those two lawsuits which ABAT did (one just weeks ago), if they are or were a shell. There is plenty of evidence of their products on the internet if you search properly. They have filed 8-K fillings not long ago, also showing evidence they are still alive and operating.
The only real issue here with ABAT is will they report past due financials finally (there is still an active battle between the US SEC and big four Asia-US auditors over China law and US SEC demands for audit papers the SEC knows can not be produced with out violating China criminal law), before the SEC deregisters the shares, thus making them illiquid (I think the SEC held off while the 2 lawsuits were pending and being fought by ABAT in US courts), and will ABAT buy out US investors, go private or move to an Asian exchange.