It’s just an unique identifier and as isPermalink is false it does not have to be a working URL:
The URLs you posted do not work as the link to a post consists of the topic slug, topic_id, and post_number (not post_id).
It’s just an unique identifier and as isPermalink is false it does not have to be a working URL:
The URLs you posted do not work as the link to a post consists of the topic slug, topic_id, and post_number (not post_id).