I agree with most of it except the 1500 year statement, I belief he is referencing Al suuyti comments and the sources he used was from the Israelites
https://islamqa.info/en/33689
Other then those types of prediction's there is not much I disagree with, I read this before a long time ago or a peace similar to this, you have to keep in mind that a lot of the hadiths used for the end of times in Kitab al Fitan are mostly Da'eef and hence we can't construct a methodology based on this and some are misrepresented.
For e.g. the Banu Kalb tribe, there is also one in Saudi (from the royal family) and it's very likely the spoils would be taken from them rather then the one in Syria that are broke currently, Bashar Assad tribe is called Kalbbiya but Allah knows best which is true, it's very contested.