I just visited that station's Plugshare page. All kinds of recent checkins by Rivians, BMW i4's, etc. that have full 500 amp charging capacity reporting 200 kW or more charging without apparent issues. Granted, they are 400-volt architecture, not 800 volt, but if there are electronics/handle/cable heating issues, its the amps that create the heat, not the volts. I suspect it was not an EA problem. This is in the vehicle.
Tom's test is, at the minimum, a major GM PR fail, if not a technical fail. GM has had the chance for months to act proactively and provide real-world demonstrations of the Hummer's and Lyriq's best charging speeds. GM has made several significant claims for charging speeds, including that the Hummer will add 100 miles in 10 minutes. But they should know that demonstrating really, really good speeds on their first Ultium-based vehicles is critically important to launching ALL their new EV's, including Lyriq, Silverado, Blazer, and Equinox. Words don't get you back on the road in a timely manner. The biggest single non-pack-fire-related criticism of the otherwise very-successful Bolt was its slow charging speed. The market will not tolerate anything hinting of slow speeds from GM's new EV line. The fact one of the most knowledgeable fast-charging consultants in the world, using what is supposed to be one of the best charging systems in the US, could not get a successful session of GM's first Ultium-based EV out-of-the-box looks really bad.