maybe the implication is that it is surprising he would be cracking whipped cream chargers vs. using his billionaire concierge connections to get a tank(crooked dentist, whatever).
Would look classier than 10000 little chargers in piles -- nitrous addicts can consume a staggering quantity of little pods, basically back to back constantly every 15 seconds for hours. It is reportedly very 'moreish', as the brits would say.
Previous articles about his death mentioned that he also had portable nitrous tanks that he'd use on walks outdoors in Park City and in other situations where he couldn't go through individual whip-its. His being tethered to the tank was one of the things that motivated Jewel to write the letter.