It’s a Bluesky link but he use adult tags as de facto “spoiler” tags. The problem is that content is hidden if you’re not logged into Bluesky. Here’s a Bluesky mirror site to show the entire thread…
https://subium.com/profile/c0nc0rdance.bsky.social/post/3kpkcq2ecws22
A huge hint…
It’s because this task understands “straight line” to mean “not having to change direction”.