No one can do this below:
Is there a way to have Netlify recheck this or clear a DNS cache that might be returning the old response?
Netlify has no control over third-party DNS caches as DNS simply does not work that way. You might ask the designers of the DNS specification to modify it to allow this but, with the reality as it stands today, it is impossible for Netlify (or anyone else) to do so currently.
As a side note, Google itself makes it possible to clear the DNS caches for 8.8.8.8 and 8.8.4.4 here (which are the IP addresses for Google’s public DNS resolvers). Please also note, anyone can do that so you don’t need to ask us. You can clear that cache yourself if you believe it is the cause (but I do not believe it was).
There is a support guide with more information about DNS caching here:
That said, the previous DNS records do appear to have expired and DNS lookups are succeeding for that domain now.
You can use the URL below to test:
https://toolbox.googleapps.com/apps/dig/#A/ebongo.org
If there are other questions, we’ll be here.