Inventory Import via CSV File Does Not Update Quantities, No Errors

Surprise, filling ‘Inventory Tracker’ column with ‘Shopify’ still seems to work when column is placed in product-import.csv

Setting ‘Variant Inventory Qty’ to a different value then present in the database, does not seem to have an effect.

PS. Our shop is set to standard “no tracking”, because fulfilment is delegated to webhooked Odoo backend
Exceptionally products need to be set SOLD OUT because backorder time exceed 60 days delivery from the factory.
Setting the Tracker temporarily on, with zero stock, would allow us to prevent add to carts for these products.
Any suggestion to solve this differently is welcome.