Ted here from Shopify, thanks for posting your query!
The Bulk Editor should still be in the same section but it might need to be reflected. If you log into your Shopify account and then click Products are you able to reselect those products and select inventory as shown in thie below screenshot? This Bulk Editing guide will also help.
If this option does not appear, could you describe the inventory field you are looking for and also share a screenshot of your admin with me? Just so I can try to replicate the error. As well, what device and browser are you using? If you still can't see the inventory field, could you try using a clearing the cache on your browser as mentioned here and try again?
Please let me know how this goes!