The problem with the Diamond Bros is their analysis on heresies/doctrine are about 90% quotes from councils, saints with the lowest necessary 10% conclusions, because once you spend all your time researching and organizing quotes from history, the logical conclusions follow. That's why their analysis on heresies/doctrine are so good - because it's not based on the Diamond Bros ideas; it's based on Church docuмents/quotes. They are just organizing things.
If they would follow the same process for the Apocalypse, then their conclusions would be closer to the truth. But for some reason, they use much, much more speculation on anti-christ, instead of quoting the Church Fathers/saints, who have written volumes and volumes on the topic already. They are trying to re-invent the wheel. This is why their conclusions are wrong.