I'd agree that the total amount of good information has increased but if bad infi is being added at an accelerating rate compared to good info then I wouldn't say the rate of good information is increasing in anything but the most technical sense.
For all intents and purposes the information doesn't exist if you can't find it, you can only find information as a certain rate, and a larger and larger chunk of that information bandwidth every day is bad information. The practical result is that the rate of good information someone has access to has decreased even if the total system has a nominally higher rate
For example, with small numbers for the argument's sake, say in 2000 there were 5 good webpages and 4 bad webpages added to the internet every day. Now there are 10 good webpages and 50 bad webpages added every day. That would mean we're getting more good information per day than before, but the signal to noise ratio has gotten worse, as you said.