You could say it’s a collar but the strike price of short call = strike price of long put. Yes, the investor owns the shares.
There is counterparty risk in the long put position (unless the put option is exchange-traded). The position is “riskless” from a market/price risk perspective as any movements in the share price will be offset by the (long put,short call) position.
Since the share value is protected from a drop below the strike price (by the long put), there is no rush to sell off the shares, hence the taxable event can be avoided for now. And for the short call positions,
If the share price increases above the strike price of the call, then the shares owned by the investors will be delivered to the call holder.