Hey Jose,
that is correct, the responsive.css mostly contains features that allow for the proper functioning of the theme on smaller screens rather than styling, thus it is originally not intended for overrides via child theme; hence the “get_template_directory_uri()” usage. However, if you do want to change it in the child theme, you’ve done the correct thing by changing to “get_template_directory_uri(). Do not forget to include the original file using the @import declaration (see the child’s style.css for an example).
Sincerely,
Andrii / Satori Studio