Possibly fair point about the gym supplying, however I've never worked out at a gym in a climate where I'd need it. I can imagine gyms in Thailand or Indonesia being so humid to need it though. Heavy deadlifting is subjective; very few people "need" chalk under normal conditions.
The article writer mentions rings though. I can def see a need for the chalk if they are doing rings.
as an anecdotal counterpoint, I always used chalk for any deadlift over 2 plates, otherwise I was simply unable to grip the weight at all. And while I didn't need it for virtually any other exercise, sometimes when my hands would be extra sweaty a little chalk went a long way in improving my grip, for example on the bench. I can use more strength in the exercise itself rather than worrying about losing grip
The article writer mentions rings though. I can def see a need for the chalk if they are doing rings.