If it was the variety we thought it was, definitely edible shoots...not so sure after looking at 'The Big Book of Bamboo' from the library!
Definitely not river cane although we have some on the creek nearby and it's fairly common here....we used to harvest it and bring home truckloads to our cabin...the goats cleaned the tops for us.
This has a double ring, a groove up one side, grows over 20' tall, and a couple other things that we thought indicated it was
phyllostachys bambusoide
Some that has died out is over 2" but most is so crowded it's coming up small.
https://en.wikipedia.org/wiki/Phyllostachys_bambusoides
We hear from someone who knew that Aunt Tilly planted it and it would have been long enough ago that we thought it was the type the USDA was promoting as a useful thing to plant and maybe not explaining how to keep it in check?
We use a lot for woven garden trellises...and curtain rods and plant stakes and a few other things.
The attic of the garden shed is full of curing bamboo.