In the irony section, the writer does not only recommends IntelliJ IDEA, but uses the URL https://www.jetbrains.com/idea/download/#section=mac. While I have no personal problem with people using Macs, I find it hilarious that a site called OpenSource.com, which is ran by Red Hat is sending its readers to the mac section of a proprietary IDE.
No, you're right, it is ambiguous, if you just take the concept and rules then its "you don't need my permission at all." and if you want to use some of the original text then you'll need to contact Vincent Baker, and it may go all the way to purchase a license. So your initial idea was correct.
In the irony section, the writer does not only recommends IntelliJ IDEA, but uses the URL https://www.jetbrains.com/idea/download/#section=mac. While I have no personal problem with people using Macs, I find it hilarious that a site called OpenSource.com, which is ran by Red Hat is sending its readers to the mac section of a proprietary IDE.