You may find it obvious. Some people don’t. This is a fact.
You need common sense here, not tone tags. This is a fact.
And a lot of people simply just can’t. This is like saying “don’t be sad” to someone who’s depressed (this is not a perfect example, but good enough)
Anyone over 7 has the common sense that time travel isn’t real. It’s a fact you can’t go into 2048. A tone tag isn’t needed.
Yes, they’ll know time travel isn’t real, but they still won’t know why KuromiNotTaken posted that.
If they know it’s not real, they know it’s a joke, thus the tag is not needed!
Doesn't necessarily have to be one. It could be confusion, a typo…