I thought posts are only visible if they are in Discussions or in Solutions in a kata already solved by whoever is on Home.

Because your posts here are visible in the homepage otherwise.

Why does there have to be a spoiler flag? This is the Solutions page, not the Discussions page.

Spoiler flag...

First difference will be the number of function calls. That should be enough (for a general matter. Here... You won't see much differences, ofc)

Python: specifies output as being expected as true or false, when it is expecting True or False