I don’t know the IB system, but AP tests are equivalent to testing students on a first semester college class. In computer science in the US, that means basic data structures and simple algorithms, and it’s been that way for the last thirty five years at least.
I generally don't like to say people are making things up, however there is a lot of mythology around how much work IB students do. I've frequently seen IB students while I was in undergrad boasting about their level of proficiency, despite it seldom being supported.
