The ones at Dunes in Marina I only didn't hit 40 kW on my Bolt (I'm pretty sure I was below 50% SoC when starting) so I assume that wasn't upgraded.Since the Tesla adapter is limited to 125A and most DTA stations are limited to 100A, the charging speed in kW actually goes up with SOC. 40 to 42kW is actually high for a 100A station at that SOC. Is that what you were surprised about? 36-38kW would be more typical on a 100A station.
I've gotten higher that 40 kW on my Bolt on most of the other DTA stations I've used, admittedly not that many.
PlugShare - Find Electric Vehicle Charging Locations Near You was where I saw the Model X hitting 40 to 42 kW. As for surprised, I was surprised to see the CHAdeMO adapter anywhere in the US. I've not seen that before myself. (Yes, I know of a few folks here on TMC who have and use theirs.)