I'm sorry I haven't use Windows for a while but there latency, as you call it, is much better on Linux/MacOS based machines than on iOS. Switching between windows without waiting, multitasking all those, and more, things are much better on computer.
So he is not using iPad, he is using Linux machine. It's like Google employee saying: "I am running the whole Google search on my phone" after he SSH to main server. iPads, in current form, are not suitable for any efficient and high quality content creation. Of course they can be used as a "terminal" to access machines/devices that can do that but you can't really seriously work offline on it.
Even for web development it's useless for me. Today I had to install new package via composer, install new package via npm, do multiple gulp/grunt runs, regex trough 100k+ lines of log files, ssh multiple times to the server and build docker containers. And that's just average day at the office as PHP/JS dev / devops. Try to do that on iPad.
Only in benchmarks. Look at the workflow presented in article. There is no builds required nor CPU heavy processing. But there is a lot of switching between applications, multi windows etc. iOS UI is not prepared for this kind of workflow. Even the newest improvements on iPad Pro are far away from being as useful and as fast as on normal laptop.