Is DynamoDB Offline while Scaling Throughput of Write Units and Read Units?

Reading the current dynamodb provisioned write units the api docs recoment to wait for tableExists E.g:

dynamodb.waitFor('tableExists', params, function(err, data) {...}

Developing an application which will scale a lot on traffic peaks I'm curious about:

Whats is the state of DynmoDB while scaling the throughput?

Am I right with my understanding that DynamoDB is fully down/offline while scaling the provisioned throughput write units?