It's not open source, as it uses the Commons Clause which severely limits what can be done with it (the name is misleading).
open source doesn't mean source code is there. open source has a specific definition. There is a list of acceptable open source licenses, as defined by OSI. similarly there is a list of acceptable free software licenses, as defined by FSF. Broadly, the two lists are the same. Commons Clause is definitely not open source.
https://commonsclause.com/#faq
> Is this “Open Source”?
> No.