Does the GFW-MICSTDBAG include a shoulder strap?

No, there is no shoulder strap on the GFW-MICSTDBAG. This bag has no attachment points for a strap.

The closest solution, with a shoulder strap, would be the GX-33 - https://www.gatorcases.com/products/microphone/wired-mic-cases/lightweight-microphone-stand-bag/5-microphones-3-stands-bag-gx-33/