I can't watch the video as it is not available, maybe not made available in my country.
I understand that you have made adjustment to the original code but you should ask permission from the author whether you are allowed to make profit from the code.
I suggest you remove the code above and rephrase your post.
Just make this a donation for people who are interested on your work.
Give credit by mentioning the original author name and linking back to the original project you modify the code from. This is more fair to the original author.
Explain to the community that the price you asked for is covering the effort to make the port from B4J to B4A.