Assuming they read the post, they're not only aware of it but also read the post's author warning their fictional subject about the performance problems of using transpilers in production, and shrugging it off for the example because it's just a learning exercise and "easy to change later".
The warning in the content is (correctly) against performing the transpilation in the client; the fix is to run the transpiler on your server, preferably as part of your CI build process.
