Hi,
We have not seen your video because your video is not processing completely: https://ibb.co/SvWS9pG.
In general, changing the product data variant of a product should not automatically change the number of product categories in WordPress.
The number of product categories displayed on your website may be affected by various factors, such as the product filter settings, the number of products assigned to each category, or any customizations made to your website’s code or plugins.
Best Regards.