Non-commercial means that you can use it for personal use and not for business. Showing advertisements in your feed would very likely constitute non-personal use. After all: you want to show the ads so that you can make some money. That's a business.
I can also easily imagine that showing the RSS feed on a company web site or on a personal web site that shows advertisements next to the feed, is also interpreted as commercial use.
Of course I am not a lawyer (nor are most people here, given that the programmer's focus of Stack Overflow), but I tend to err on the side of caution in cases like these.