Did you have a good weekend?
Additional information content is rendered with woocommerce function automatically.
So you can't edit that.
And shipping info content is rendered with our theme function. So you can edit it.
Please go to theme options->single product->filter tabs. https://prnt.sc/11pefkv
In there, you can edit the shipping info content.
In the tab content field, you can add the created html block shortcode.
If you leave the empty fields (title & content). you can remove shipping info tab on product page.
Sorry for our late reply.
If you have the other questions, please let us know again.
Best Regards, C-Themes