The reviewer did note an issue with the placement of a hose clamp, something that Lucid is addressing -- but, unless you can point to something in this video that I missed, nowhere did Munro's team say the coolant system was "very poor". In fact, the reviewer called Lucid's cooling system "simple but elegant".
If so, the only aftermarket work done on the car of which I'm aware was by me: a full Xpel wrap and installation of a radar/laser detector system. The detector system was installed by the same shop that installed the system in our first Dream Edition. And both the cars were checked out by Lucid after the installations, as they had to go to the Service Center to have the lidar units recalibrated afterward.
Before I bought it, Lucid checked all the service records on the second Dream Edition and found no sign of any aftermarket work on the car as well as no indications it had been wrecked or undergone any major repair work. It had only been through the same two recalls as our original Dream Edition.
The only sign of anything untoward was that the driver sun visor had either been removed or become detached, and the glue used to reattach it did not hold. That is why the first windshield had to be replaced. (This apparently is not unique to Lucid. My brother had a Lexus GS 450 in which the rain sensor became detached from the windshield. Replacing it also required a replacement of his windshield with a Lexus OEM part, because it would not properly adhere to an aftermarket windshield for some reason.)
Although a few accessories are appearing, the aftermarket has not developed any replacement or repair parts for Lucids. Lucid is the only source for such parts, and they will not sell parts that have any role in the structure, safety, or operation of the vehicle to anyone other than a Lucid-certified facility (although some non-certified shops occasionally try to get them from Lucid).