That statement is categorically false. One simple example is online gaming/MMOGs where a latency of 200 ms would be be a miserable experience. The upper bound often targeted for "acceptable interactivity" is somewhere between 100-130ms.

Your numbers are wrong but your line of reasoning is actually the basis of how Fastly's network was designed to be different from Akamai's. There's a graph about it at the 2:40 mark in this video: https://vimeo.com/132842124

200ms is human reaction time, you can definitely notice it; the rule of thumb is 100ms https://www.pubnub.com/blog/how-fast-is-realtime-human-perce...