A lot here is based on speculation. Also instead of he/she and similar stuff ill just put the male version so its easier to read than he/she. If Nastyox says he/she is a girl or male I will change it.
Nastyox is a user here in dev.to he has been liking all my posts so I decided to look into him. He has only 3 posts but 1121 hearts in total. Nastyox also has his own GitHub page for his library random.js. It's a cool library for truly randomizing things. The GitHub post has 330 stars.
This success wasn't only due to his great writing in posts or his great library it was due to free marketing. Nastyox likes many people's posts in dev.to because if someone likes your post you might look into who liked them just like I did. Once you click on him/her you see 3 posts 2 of them relating to his random.js library. This isn't the only thing he does I checked his socials such as Reddit and I see they have only been used to promote his GitHub.
I can't really tell you as a fact that he does or he doesn't. In Nastox's posts, he seems like a nice person and everything he does could easily be done without a bot so I think he doesn't use one.
Developers like us need to be more like Nastyox and use social media as free advertising.