Hi Allen,
Thank you for reporting this.
I also confirmed that the guide Combining native and banner ads for
iOS wasn't accessible on my end as well. However, the said guide for
Android is accessible.
With that said, could you please provide us the project (or at least a test project) where the issue is reproducible. Once provided, I could verify this on my end and raise it (including the reports thus far) to the rest of the team.