If the claim is about whether AI latency will be high for "various applications" then I agree. We already have some applications, such as integer arithmetic, where speed is optimized heavily, and computers can do it much faster than humans. 

In context, it sounded like you were referring to tasks like automating a CEO, or physical construction work. In these cases, it seems likely to me that quality will be generally preferred over speed, and sequential processing times for AIs automating these tasks will not vastly exceed that of humans (more precisely, something like >2 OOM faster). Indeed, for some highly important tasks that future superintelligences automate, sequential processing times may even be lower for AIs compared to humans, because decision-making quality will just be that important.