Earlier quoted context omitted.
Do you think locally managed systems are immune to outages? Or that governments are capable of resourcing their teams sufficiently to do a better job at availability than Microsoft, Google, or Amazon?
On the evidence, yes. Cloud providers frequently have outages lasting multiple hours affecting millions of clients. Some governments manage to run critical servers without downtime.
But if I had to make an a priori prediction about which systems would have the better reliability over the long term - cloud-based or those run out of a corporate DC - my money would be on the cloud-based systems.
The cloud providers are going to have better management of power/network/hardware than the most mature government agency, simply because it's a core capability for them.