Sourcehut does not—nor does it support SVG. If you need something animated, you must use animated PNG (APNG) or GIF.
Nobody said anything about sourcehut though.
Do they have to? HN always talks about alternatives in every article. It's a bit of perspective on what another Git forge is doing in case people were curious. I've been both upvoted and downvoted for the comment so someone found it interesting.