The following undocumented API end point can load the first 59 messages if the VOD exist.
But this api call response with a json structure and this will change any time without warning.
Response the first 59 messages from the actual VOD and next page id:
https://api.twitch.tv/v5/videos/[VOD-VIDEO-ID]/comments?content_offset_seconds=0
https://api.twitch.tv/v5/videos/[VOD-VIDEO-ID]/comments?cursor=[next-page-id]