If you're a monolingual American born English speaker and you learn Chinese and go live in China for a year, you're going to come back with a much different understanding of Chinese culture and its people. Who cares if your IQ went up or down half a point on account of learning to speak mandarin- your understanding of the lives of billions of people just increased dramatically. That's why it's good to learn a language- culture, not cognition.
https://www.theguardian.com/global-development/2021/feb/23/r...
Well that just about says it all eh? Let's put everything else aside, how do you hold this opinion after January 6? And this article was written today?
To beat the dead horse, deadlifts definitely involve pulling but it's primarily a glutes exercise. Adding in dedicated pulls like pullups and rows will give you a lot of bang for your buck.