It’s possible, the torture method came from the Japanese. They would do it to POW’s and civilians during WW2.
Also “stalk” plants grow abnormally quickly. Asparagus for example can grow an entire stalk multiple times a day when cut, and bamboo grows absurdly quickly, 70 or so centimeters a day is not uncommon. Especially for young plants.
There's actually a Mythbusters episode about it (you can find it on youtube)
Fast is relative, but yes bamboo can actually grow through a person, the shoot is surprisingly sharp and the human body is not that much tougher than soil