Found this article on gsmarena where Huawei was caught with its pants down using DSLR to take promotional selfies shot using Canon DSLR.
https://www.gsmarena.com/huawei_uses_dslr_to_capture_selfie_featured_in_nova_3_video_ad-news-32849.php
https://www.gsmarena.com/huawei_uses_dslr_to_capture_selfie_featured_in_nova_3_video_ad-news-32849.php