Based on response from AppSumo support:
Please know we've reached out to the pxl.to team to learn more about the current outage and we apologize you're unable to access the tool. Despite our efforts to reach the Partner through various channels, we have been unable to reach them for an update on the status of the product so far. Unfortunately, at this time, we cannot confirm if or when access to this tool will be restored.

As this product was purchased over a year ago, it is now well outside of our 60-day money-back guarantee. Additionally, our We Got Your Back guarantee only applies to purchases of AppSumo Select deals. That said, we’ll always be happy to process qualifying refunds under our 60-day refund window and our We Got Your Back guarantee in the future.