WP_Block_Styles_Registry::unregister( string $block_name, string $block_style_name ): bool

120	public function unregister( $block_name, $block_style_name ) {121		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {122			_doing_it_wrong(123				__METHOD__,124				/* translators: 1: Block name, 2: Block style name. */125				sprintf( __( 'Block "%1$s" does not contain a style named "%2$s".' ), $block_name, $block_style_name ),126				'5.3.0'127			);128			return false;129		}130 131		unset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );132 133		return true;134	}