Q: Can I edit the listed item's description page using SKUGrid through non-api method?
A: No. This is not possible with sku grid or sku fetch when not using API.
Sku Grid only modifies price/stock. Our listing tool -- Sku Fetch does not revise item descriptions after items have posted. That can only be done if you listed using API with Sku Fetch + Wise Lister. It's not possible when listing without API using file exchange.
Please note: Any modifications to your listing descriptions have to be done directly on eBay.