From the same knowledge base article:
"Deprecation does not mean the immediate deletion of an API or technology. However, FileMaker recommends that you migrate your solution to use other APIs, technologies, or alternative features of the product because the deprecated interfaces may be deleted from a future version of the application."
In other words, 12.0v5 is compatible with Snow Leopard, but future major versions of FileMaker Pro (or minor updates to version 12) might not be, and FileMaker Inc. recommend updating to a later operating system if you intend to use future versions of FileMaker Pro.
Yeah, I read what you cite, but its meaning eluded me.
So 12.0v5 is not worse than 12.0v4 or earlier for use with Snow Leopard...
That is what I needed to understand.
Thank you for the clarification.