From an older thread:
I see this in the way that if you would select shuffle in album browser, then these blocked albums wouldn’t play (because they are blocked, they would fall out of the list of almbums to shuffle) but I think Roon Radio is track based so I fear you have to block every track to achieve that what you want. But ban is heavy as it affects not only Roon Radio. That’s why the ROONRADIOBAN file tag was introduced in Roon (1.3 if I remember correctly).
Maybe a focus on format – depending on where you start at and what you want to achieve – can also do the trick for you.