No, in the video description on fantia she explictly gives a boob warning saying this video is 1 year old and this was when she was 10kg lighter before she put on weight. This was back when she was C cup (she wrote this in a twitter post when she initially said she wanted to gain weight). She is now G cup as measured in a much more recent twitter post.
She has definitely gained weight but it seems 50% of it went to her thighs and 500% to her boobs lol