I was confused about how this was written in the article. Sure, include system time, or a simple get current time tool, whatever, it’s inconsequential for the most part, but who is out here changing datetimes in a conversation and invalidating prefixes?

If you need to, just prefix user messages with the current datetime.

Why is this even a complaint?

I suspect that if you prefixed every user message with a date the model might get confused and start treating the date as more relevant to the current task than it actually is.