It sounds like you think it is fine to make claims that are unsupported by any evidence, or by basic logic, until a counter-example to your claims is physically available for independent testing. That’s unbelievably disappointing to hear.
"Our device works perfectly in all climates, while electric vehicles lose more than 40% of their range in cold weather, making them impractical for many parts of the world.”
Having this tagline on your website is ignorant if you hadn’t done the math, and intellectually dishonest now that you have.
I agree that the “huge point” of this announcement is the device you’ve created. You just don’t need to resort to misinformation to promote your product.