No the Enterprise Cloud is just the same GitHub.com with the same shitty reliability.
However the newer Enterprise Cloud with Residency (aka on Azure) is a separate partition and has a different reliability domain (still subject to Azures bad reliability so not an entirely compelling offer). This is what you linked.
However the newer Enterprise Cloud with Residency (aka on Azure) is a separate partition and has a different reliability domain (still subject to Azures bad reliability so not an entirely compelling offer). This is what you linked.