You can just paste the link normally. If you want custom text on the link, you do this
[Custom text](https://example.com/)
Renders this
Also I think the post is talking about hiding the data to begin with. There are already some tracking tools out there that look at the existing data. If the data isn’t accessible to you, then it’s not accessible to the AI either. Nothing for anyone to look at
Although I’m not familiar with flight details to know what exactly is being hidden, or if there are workarounds