Hey man, if you are in a bind. You can create an introductory course on a page that is only accessible for someone who has JOINED a Wix Pricing Plan which could be set to a price of $0. Just a thought. I met with the Online Program team and apparently there are some updates about to be made along with API access this year (hopefully within the next couple of months).
I share your frustration. This thing is buggy as f*** and with just a little updating could be a competitive solution for influencers, coaches, or anyone wanting to commoditize their knowledge.