You might contacting your local Google Merchant helpdesk to ask them why you get this message because as far as I can see this category is still available at Google under category number 567 (see https://www.google.com/basepages/producttype/taxonomy-with-ids.en-US.txt).
Hi @clicksquad,
Where you able to solve the issue? Can we close your topic?
Hello @clicksquad,
I hope we were successful in helping you resolve your issue with our Feed Manager plugin! Since we have not heard back from you in the past 2 weeks and we don’t want to leave tickets open forever, I will now be marking this support topic as resolved. However, if we still haven’t resolved your issue please reach out to us as we would be more than happy to further assist you!
Thanks and have a great day!