This project is fairly old and there's probably code I could write differently, though I don't revisit old stuff (so many new project ideas and not enough time). Regardless, I'm very happy it had been helpful to you and thank you for crediting me!
Yes, it's probably not a thing that players are cautious about, usually the worst you get is a broken link to a non-existing page. When you wrote your comment I was also suddenly thinking about whether displaying @handlename could have been alternative for the label, but a player might not recognise it as a clickable link. Not to mention, there are so many Twitter alternatives nowadays and a handle wouldn't be clear which site it represents. So your way of doing with "Twitter" as label is still the most common and intuitive for an average Ren'Py player as other devs do it the same way as well from what I've seen.
I wish you all the success for finishing your game!