seems to be a reference to a dubbing or a language translation of the book or possibly the TV series based on the books. However, I couldn't find much information on an "Isaidub" version of Goosebumps.
A "useful write-up" for Goosebumps (2015) —often referred to as Goosebumps 1 Goosebumps 1 Isaidub
Directed by Rob Letterman, this film is a live-action/animation hybrid based on the iconic children's book series by R.L. Stine. Unlike a direct adaptation of a single book, the movie features a unique meta-plot: seems to be a reference to a dubbing