Hello,
Sorry to say but this is the default WooCommerce Sorting and to hide any of the values from it, it would require a Code Snippet from the WooCommerce end.
Although, you can try out the following Custom CSS in this regard and see if this works out for you or not:
.woocommerce-ordering select option:nth-child(4) {
display: none !important;
}
.woocommerce-ordering select option:nth-child(5) {
display: none !important;
}
Location to paste Custom CSS, go to Dashboard >> Theme Settings >> Custom CSS >> Global CSS section >> paste the CSS.
Best Regards