I don't see how that chalk bag can be useful without 1. climbing shoes and 2. a harness and/or a crashpad. I guess he boulders barefoot at an indoor gym?
But then I read the description and it sounds like it's for general working out or something? IDK, I've never personally needed chalk for or met anyone that needed chalk for lifting. Perhaps he works out in very humid climates, but I'd think there would be chalk provided at the gyms? Likely an item that could be practically dropped?
Just as another data point: I've never been to a gym that supplies chalk to members. If you're doing heavy deadlifting or olympic lifting then chalk is nearly a requirement.
The article writer mentions rings though. I can def see a need for the chalk if they are doing rings.