What he means is:
This talk is only 30 minutes long so I will be simplifying things. You'll
understand it better if you read C.
"Squint and read" seems to be a faddish idiom. To squint at something means to peer at it with one or both eyes narrowed in order to see it more clearly. [One may also squint at a bright light to protect one's eyes.] The correct expression would be "squint at and read (something)".
A squint meme appeared around 2013, possibly originating with this picture:
And soon several variations, including a "squint read" meme, began appearing. Evidently these were popular enough to give rise to "squint read" as a vogue expression.
When the lecturer says, "I'm gonna do like a lot of simplifications" and "you should be fine with this talk" he is using the language of young people; trying to show he's down with the kids. He uses the expression "squint and read" similarly, to persuade them he is cool.