Outlet - Remove homepage categories

functions.php

add_action( 'init', 'jk_remove_homepage_categories', 99 );
function jk_remove_homepage_categories() {
	remove_action( 'storefront_page', 'outlet_homepage_navigation', 5 );
	remove_action( 'storefront_page', 'outlet_homepage_content_wrapper', 6 );
	remove_action( 'storefront_page', 'outlet_homepage_content_wrapper_close', 30 );
}

In Storefront 2.2 I believe this should be storefront_homepage instead of storefront_page?

Correct, the snippet below works as of Storefront 3.6 and Outlet 2.0.15:

add_action( 'init', 'jk_remove_homepage_categories', 99 );
function jk_remove_homepage_categories() {
	remove_action( 'storefront_homepage', 'outlet_homepage_navigation', 5 );
	remove_action( 'storefront_homepage', 'outlet_homepage_content_wrapper', 6 );
	remove_action( 'storefront_homepage', 'outlet_homepage_content_wrapper_close', 30 );
}