Does using WP API for blog on React app decrease SEO benefits?

I currently have my blog on Medium, which I'm looking to import into a blog hosted on my domain where I have my React app running. I would put it on https://www.mydomain.com/blog

I found this article about setting up a free blog on WordPress and then using the WP API to display the posts on my domain:
https://www.freecodecamp.org/news/get-a-blog-on-your-website-with-react-and-wordpress-api-c63ff81b388e/

My question is, would using the API have all of the SEO benefits as having a separate domain registered through a PHP-based WordPress blog? Thanks in advance for any help.