Hi,
It's possible yes.
You can for example use the "user group after purchase" setting of the products for that (HikaShop Business only).
First, create a user group for the joomla article. Then, make sure the article page is only accessible for users of that user group. Finally, create a product with its "user group after purchase" setting set to this user group.
An alternative would be to use an hkshow content tag in the Joomla article in order to have its content displayed only if the current user has purchased a specific product:
www.hikashop.com/home/blog/471-hikashop-4-4-3.html#tags
For bonus points, there is also a content tag to display an add to cart button on the article:
www.hikashop.com/support/documentation/1...-product-insert.html
So you could combine this with the hkshow content tag to either display the content of the article or a message with an add to cart button.