In my high school the order of classes was, if I remember: Algebra I, Geometry, Algebra II/Trig, Analysis. Calculus was still "after" high school at that time (

In my high school the order of classes was, if I remember: Algebra I, Geometry, Algebra II/Trig, Analysis. Calculus was still "after" high school at that time (early 90s), though starting to become common. So Analysis was kind of pre-calculus, a variety of different subjects that weren't quite calculus. I remember bits of algebra, probability, compound interest, etc. We didn't have Analysis I/II, but the boundaries between Algebra and Analysis were so vague that it is easy to imagine some split it differently. It seems quite unlikely the author was referring to Real Analysis! Still I can't find nearly any reference to high school Analysis (except https://calcworkshop.com/math-analysis/ https://calcworkshop.com/math-analysis/), so I'm guessing that terminology is nearly gone now.