Watermelon Rind Pickles

I’m planning on making the pickled watermelon rind recipe from the NCHFP website and am wondering whether I should add pickle crisp or not. I’ve never had pickled watermelon rind and so I’m unsure of what the finished texture should be.

https://nchfp.uga.edu/how/pickle/fruit-pickles/watermelon-rind-pickles/