Totally fake. Its obvious that what they show is some small pyrotechnics combined with CGI smoke.
Remember, this is the same company whose early advertizing for their first synthetic oil showed a room full of 4-cylinder engines "running without oil" after having been filled with different brands, and only the Castrol engine kept running. That commercial was resoundingly de-bunked as a fake.
Even if the product is great, nonsensical advertizing like that is the one reason I refuse to use any Castrol products anymore.