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It's mostly true. Most universities require that incoming bachelor's degree students to have finished either a matching pre-university secondary education program or pass a test (only for people of 21+ years old) that checks whether a student has the required Dutch/English/math skills. After this, universities are allowed to boot students that fail to pass 50, 80 or 100% of the courses in the first or second year (actual percentages differ per university).

On the other hand, master's degree programs tend to require a bachelor's degree that has sufficient overlap in terms of courses. So to start a Computer Science master's degree, you'd probably need some bachelor's degree in engineering, math or physics. If you for instance got a bachelor's degree in Psychology, you'd probably need to attend several courses in order to be allowed to join.