Default GSI Limit 20 (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-indexes-general.html)
Yes, the limit was raised a while ago from 5 to 20. I had changed it in my slide deck but missed the edit for this when I updated this lecture a couple months ago. Thanks for the catch. I just pushed an update.
As an aside, I’ve never had an exam question test my knowledge on specific service limits…mostly because those things change lots and it would be hard to keep the exam questions current.