Wrong. Within New Vegas we have confirmation that there are still multiple Enclave outposts in the Chicago area.
Your evidence is a audio log from a Enclave Scientist that send a Eyebot to a long abandoned base ... that means when it was sent Navarro base was still operational or believed to be operational.
Consider this, Eden's Enclave was the remains of the Enclave that made journey from the West Coast to Washington D.C.
I would say there are some ... problems with the timeline, to start it mentions Adams Air Base that means it was after they reached Washington D.C. and also it mentions the Hellfire Armor project that means the Armor project was not completed at that point.
Now that means it was send AFTER the destruction of the Oil Rig, AFTER their arrival at Washington D.C. but BEFORE it was assaulted by NCR forces and THAT means those Chicago Area outposts were around at the same time, I know some are going to say "but they could have hidden or classified the loss of Navarro" but I operate under the idea unless its been stated as such I will only use available facts and none say they covered up the loss of Navarro.
Now lets see dates ...
2242 - Destruction of the Oil Rig (FO2).
2254 - A Brotherhood of Steel squad led by Owyn Lyons is sent to Washington, D.C.
2255 - The Capital Wasteland Brotherhood of Steel establishes the Citadel as their main base of operation in the ruins of The Pentagon.
2278 - Raven Rock is destroyed as well as their faces in Adams Air Force Base.
2281 - A Courier is ambushed and shot in the head in Goodsprings Cemetery.
So lets see ... a Brotherhood Squad takes about 1 year to go from Lost Hills Bunker to Washington, D.C., now ED-E takes THREE YEARS to make the trip from Washington, D.C. to whatever the place that Courier found it?
Sorry, does not add up ... we dont know WERE that Courier found ED-E and how long it was out, no way the trip of a fast moving Eyebot would take longer that of squad wearing Power Armored, even by taking the scenery road by making a stop at Chicago there is no way it would take THREE TIMES the time a the BoS squad that also made a stop at Pittsburgh.
You are using the lack of facts to say "we can have the Enclave" but I can also play that game showing were the facts show how.
1)We dont know when the Eyebot was sent but clearly it was after 2242 and before 2278.
2)We know there were Enclave outposts in Chicago at that time.
3)We know it taken a BoS squad about 1year to travel from Lost Hills Bunker to Washington, D.C
So everything says ED-E was disabled well before the Courier found it in Primm, I doubt it was just 3 years ago as I serious doubt that Hellfire Armor development taken days to complete and had starting production long enough to outfit several squads, even if the Advanced Power Armor taken only 5 years to complete and had a very stormy development cycle it still had 17 years of failures before the Presidential order was issued so I cannot see Hellfire Armor taking so little time and being manufactured and issued in such a wide scale.
It all points out ED-E was send a long time ago, back when Navarro was still a Enclave Base and was disabled on route and one day a courier drop it in Primm.