This was in the updated FAQ in the Flagship section:

Q: Do Nano Technology and Type IV Drive affect Flagships?
A: Yes.

So... awesome! Are flagships affected by other techs like Assault Cannons? How do we know?

So, to clarify the question:

Nano Tech and Type IV drives do not specify that they affect flagships, and the Flagship rules give no clarification like "a Flagship is affected by technology cards as though it were a dreadnought." So why does the FAQ say that flagships are affected by these techs?

rowanalpha said:

Because FFG decided those two techs affect flagships. They did not include Assault Cannons for flagships in this FAQ, so no, that tech does not work for flagships.