With what hook do I remove WooCommerce existing Product Data Tab form fields?

You find the code for the general tab in the file includes/admin/meta-boxes/views/html-product-data-general.php. In this file WooCommerce defined some do_action hooks. Maybe your plugin used one of them.

WooCommerce Product metabox

Hooks:

  1. woocommerce_product_options_pricing
  2. woocommerce_product_options_downloads
  3. woocommerce_product_options_tax
  4. woocommerce_product_options_general_product_data

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