I am sure you are already aware of this, but just wanted to place it here for others that might be getting 'stale" data on the Incognito Tool.
It appears the cors-anywhere app you are hosting on heroku is hitting a usage limit, and causing a 429 failure when querying node status. I imagine the issue is coming from the success of your tool to help the community and its adoption, which may require additional support by community to cover operational cost.
Either way, I really appreciate the tool and hope a solution can be found to help with the cost and fixing the limit rating on the app server.