I'm not sure where you are getting those numbers from, but according to Open Secrets, in 2018 a Democrat was top receiver from Comcast. McConnell is fairly low on this list. Can you share your source?
I'm guessing it also comes from opensecrets. Not sure why the two views of data are in apparent disagreement, but when you look at what McConnell received from Comcast instead of what Comcast gave, the number does indeed jump to just under $100k: https://www.opensecrets.org/members-of-congress/contributors...