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Does this reverse time though? 0.9c is 90% of lightspeed, and for the sake of your example, 500c is just instantaneous.

If light is just information, wouldn’t it just be a matter of seemingly getting something very fast?

If you're traveling at 0.9c then there will be significant time dilation. Since velocity is relative, both parties will see each other as severely time dilated which can lead to somebody receiving a reply to a message before they send it.

But how do you know that you need to send a message or what if you don’t send a message? How can you get a reply?

Everytime I think I get it, I don’t!

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