The easter egg means that BT is not dead yet, or that the core of BT has not been destroyed. In the chapter "Blood and Rust", BT mentioned that although it was separated from Cooper, BT could still see the images that Cooper saw through neural connections.

The rebels finally said that they also wanted to eliminate the neural connection between Cooper and BT. If BT has been completely destroyed, then there is no need to eliminate it at all. One of the two points no longer exists, and there is no need to eliminate it. There is no connection anymore, which only means that there is still a connection between BT and Cooper, so this connection needs to be cut off.

It can be seen from the fragmented information in the chapter "Cause and Effect" that the essence of the Holy Ark weapon is not destruction, but distortion of time and space. During the first explosion, Cooper was not affected because of his wristband, but BT was stopped by time. Therefore, when a space-time explosion occurs on Typhon, it is very likely that BT will not be affected again because it was affected once before.

In other words, this is not an explosion, but an exchange of time and space. BT and the current Typhon star have exchanged time and space with the time and space before the Typhon star was formed. However, because the spiritual connection between BT and Cooper is It’s super-material, so it can still be sensed.

Extended information:

Game background of "Titanfall 2":

The war in the story takes place in a star system whose environment is very different from the Earth where the "Core System" is located. -"border". The Interstellar Manufacturing Co., Ltd. (IMC) and the Border Resistance went to war for control of the "Border". The former sought to exploit the rich local natural resources regardless of the consequences; the latter's purpose was to expel the IMC and strive for the independence of the "Border".

After the Battle of Ceres, the Frontier Resistance was able to switch from defense to offense, controlling multiple planets on the "Border" and competing for their resources. As for the IMC, although they were losing ground due to the destruction of the refueling facilities by James MacAllan and the lack of support from the "core system", they were still the party that dominated the situation and tried to prevent the rebels from occupying the "border".

In the single-player mode, the player controls Jack Cooper, a third-level rifleman of the Border Resistance stationed on the "Typhon Star", accompanied by his former teammates. Titan "BT-7274" to fight alien creatures and human enemies sent by the IMC.