When I click on someone's run placement, it shows a link to the twitch highlights instead of displaying the video on the page. Is this part of some update cause I remember being able to watch a twitch highlight on a speedruns page?

Can you link the run?
Twitch videos do embed but they might of used a slightly different url

@Yummy_Bacon5Yummy_Bacon5 this run specifically https://www.speedrun.com/and_yet_it_moves/run/ydrxgkjz

Looking at other Twitch videos that embed, their urls are /videos/id and not /steamer/video/id
It uses an older url because it was uploaded 4 years ago
So this should be the updated one twitch.tv/videos/160906866

You should report this bug to support hub btw

where is the support hub, btw?

Dropdown the “More…” tab at the top, and you should see it. https://www.speedrun.com/knowledgebase/supporthub