If Tesla used R-290 or R-600 (propane and iso-butane) refrigerants in their AC they are well idiots and there is little chance that this would’ve passed regulation.
The video you linked looks just like batery venting.
>”Although the product is classified slightly flammable by ASHRAE, several years of testing by SAE proved that the product could not be ignited under conditions normally experienced by a vehicle. In addition several independent authorities evaluated the safety of the product in vehicles and some of them concluded that it was as safe to use as R-134a...”
As far as Europe goes “traditional” referigerants are not banned they can be restricted depending on the industry and usecase. HFOs are used by a few car manufacturers and ironically this isn’t even an EU thing the US started using it first iirc GM was the first as these HFOs are produced by Honeywell.
HFC and HCFC are commonly used in Europe.
Also it’s important to note that Daimler and BMW specifically stated that they will not use R1234 and Daimler even recalled the Benz’s that used it. They claimed it’s unsafe and flammable but the actual reason was most likely the cost that Honeywell and DuPont enforced on manufacturers. IIRC not only was that R1234 was more expensive Honeywell and DuPont also had patents issued on the evaporators that need to be used in conjunction with this refrigerant.
https://www.youtube.com/watch?v=2J-h6fC1GrU 2 and 6:50 minute mark for quite dramatic demonstrations
This could point to the fire being not in the battery, but the AC unit, which is in the front of the vehicle. Modern AC units contain flammable chemicals and when operating would be pressurized.