Removing website title from header

So this topic has been covered a lot as I have found through googling. However, I am after some more specific information.

I have a custom banner with my site name & description in the image itself. I do not want WP to add text to the header, as it overlays my image.

The most common advice given to people with this same problem (and one that does in fact solve the problem) is to simply delete the site title and description from settings>general. The other solution often given is to edit header.php to prevent the title appearing. However, don’t both these methods prevent google from knowing the title of your site as well? Isn’t this pretty bad from an SEO viewpoint.

I also found this site – https://wpthemepark.com/2007/07/09/how-to-properly-hide-the-title-of-your-blog.html – that says the only proper way to do it is to add this to the end of style.css:

#header h1 { display:none }

Is this accurate? I am only concerned because literally dozens of responses say to just delete the site name from settings and this was the only one to say that that’s the wrong way to do it. Am I missing something?