This isn't a serious question, is it?
A human would immediately start learning, and understanding the differences. Forming new memories. People learn every, single day.
An LLM would never have a single new memory, nor understand a single change had happened. Without being retokenized via new data it trains on, nothing of its symbolic world view would even change in the tiniest bit.
Telling it so in a context window isn't the LLM learning, that's gone the second the context window is gone. In 5 years, 10 years, 1M years, that LLM would be precisely the same. It would view the world as 1850. Forever.
Meanwhile, being told "It's 2025!" would immediately update the human's expectations. They would see the changes around them, and start learning. Note that initial reaction isn't relevant here, a person would eventually deal with it, and move forward.
You have posted a link, in another response, where someone is working on dynamically updating an LLM. However that is not how current LLMs work, thus invalid in any attempt to refute how I describe LLMs currently.
Further, until we see how this works -- precisely, it may be a non-starter. It may not work as described. It may be hype. It may work, but still require retraining if large amounts of symbolic data needs to change.
There's a reason it takes massive farms of hardware to tokenize, and I'm skeptical that the quoted twitter link reforges all relationships. Again, we'll see.. and this is something required for an LLM to actually "learn" about changes to how tokens are weighted.