Links to Additional Resources Appear Several Years Old – Are these relevant to invest time in to sit the Security Exam in 2021?

Some of the re:invent videos recommended to review in Chapter 8 ("Additional Resources for Exam Preparation") are quite old; on the order of 3 years or greater. Are they still relevant to review to sit for the Security exam in 2021? Seems like the resources link to material that is outdated. Cheers! Charles