The problem is that the author of this video has no idea what the Duffer brothers have in mind for season 5 - it may be (and judging from past history, probably is ) something completely unexpected.
I know that David Harbour said, several years ago, that he knows the ending of Stranger Things "and it is beautiful".
The Duffer brothers briefed Network executives on ST's ending - and the executives were allegedly weeping after hearing it.
Even Noah Schnapp, in his acceptance speech at the recent People's Choice Awards said that the 5th season was going to be amazing.
All of these people have some insight into what is coming - the author of this video has no insight.