So, despite the heap of evidence against the tape, you're going to focus on it and call the whole DLC crap?
Remember- we have another tape specifically stating that the aliens are creating human-alien hybrids for an Earth takeover. We also see that the aliens are making these things. 9 times out of 10, they're stronger than their creators, so that also lends credence to the "shock troop" hypothesis. Furthermore, the US senator is not being pressed for any specific information, neither is the other medic, the linguist, or the Vault-Tec CEO. If the Aliens were looking for tactically viable things, they wouldn't be saving the non-valuble info- it's trash and wastes memory.
I updated my last post. There is no other evidence against the tape that is what you fail to understand. The impication that the Aliens may have had something to do with the Great War is enough to damn the whole DLC. You can't ignore that tape, it's there and it implies aliens started the Great war. Where canon clearly states humans and humans alone caused the great war for human reasons.
The Aliens plotting to take over the Earth only adds to my argument that the Aliens would want to destroy the Earth. That they are planning to take it over. That the Aliens are in some type of civil war and we are some how involved in it, is just the wrong path for Fallout to take.
Aliens haven't been in Fallout before outside of easter eggs and shouldn't be at all. The BoS now have an Alien Mothership and the Fallout Universe will end up becoming War of the Worlds or Resistance
Edit:
Mothership Zeta is a Pandora's box that needs to be closed to keep hope for the Fallout Universe inside. If it's allowed to remain open than all is lost. Nothing good can come from it, unless you consider Aliens taking over the wasteland and for the people of the wasteland to enter in some Galactic alien civil war a good thing.