BackordersCondition.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Model\ResourceModel\IsStockItemSalableCondition;

use Magento\CatalogInventory\Api\StockConfigurationInterface;
use Magento\Framework\DB\Select;

class BackordersCondition implements GetIsStockItemSalableConditionInterface
{
    private $configuration;

    public function __construct(StockConfigurationInterface $configuration)
    {
        $this->configuration = $configuration;
    }

    public function execute(Select $select): string
    {
        $globalBackorders = (int)$this->configuration->getBackorders();

        $condition = (1 === $globalBackorders)
            ? 'legacy_stock_item.use_config_backorders = 1'
            : 'legacy_stock_item.use_config_backorders = 0 AND legacy_stock_item.backorders = 1';
        $condition .= ' AND (legacy_stock_item.min_qty >= 0 OR legacy_stock_item.qty > legacy_stock_item.min_qty)';

        return $condition;
    }
}