Since the stock is worthless, would it be considered not be tax-deductible or would there be a capital loss?

In early December 2019, a friend advised Miguel to buy stock in Pioneer Aviation, Inc. (PAI). At that time, PAI was in serious financial straits and was headed toward bankruptcy. Nevertheless, according to Miguels friend, the value of the corporations underlying assets was such that the shareholders were bound to recover considerably more than the current market price of $0.50 per share. Excited at the chance for a sure profit, on December 15, 2019, Miguel purchased 20,000 shares for $10,000. In September 2020, the trustee in bankruptcy announced that the stock was worthless and that even some of PAIs preferred creditors would not be paid.