as changing text using Ultimate branding option any impact on functionality of site?

I recently replaced the word "theme" with "tomatoheart", though it didn't show any impact on the functionality of any part of my website but my question is can it have any adverse effect in future on functionality of any theme, plugin or just any kind of working impact on my website?

Does this text replacement thing also replaces text from WordPress core files like index.php, function.php , theme CSS etc or from posts, pages etc ? Please check the attachment how it changes the name of a security plugin. Will it change it's functionality.

What will after disabling this addon or the whole "Ultimate branding" , all changed texts will get it's default text or it will still remain changed? Kindly reply.

Thank you.