Woocommerce and google sheet

I have a row search module in google sheet with the following fields (sku, price, stock and title). It is connected to a woocommerce search module that searches by sku. I have connected a router with two ways:

  1. the sku from the google sheet exists in woocomerce (I have put a filter of product id = exists).
  2. the sku does not exist (I put a filter of product id = does not exist and it does not work, I put a filter of total of numbers of bundles = 0, and it does not work either).
    I don’t know what to do to detect those sku that don’t exist. I have connected a variable set behind the woocommmerce module and it detects the variable well (0 on non-existent sku; 1 on sku if it exists). But the filter does not work