Does that work consistently for anyone else? I don't have a Twitter account but there are a couple of Twitter posters I occasionally check on - and I'm still seeing the "See more Tweets from ..." modal at times (I just verified it now).
I tried in Chrome Incognito mode and I have yet to encounter a popup, but I only sampled a few persons and only scrolled for a few minutes, so I am not sure if they only reduced the threshold or if it's not yet rolled out everywhere.