This response should be instant removal from his position. It is not just tone deaf, it tone deaf to the degree that it paints the company itself in a bad light. If the standard for toxicity is wide enough to include that statement than there is no standard at all.
Are they threatening trans users directly? No. Trans folks in the US have been targeted repeatedly. That's awful and you have my sympathy. Within the context of a single post we wouldn't consider it a direct threat or targeting a protected category. Ie send trans folks to concentration camps.