My understanding, from experience of finding similar footprints on other hardware, was that this footprint is there for testing in the factory and not actually

My understanding, from experience of finding similar footprints on other hardware, was that this footprint is there for testing in the factory and not actually intended to be a u.FL footprint for an external antenna. I think the first time I saw it was on a GL.iNet mini router which I wanted to add an external antenna to. It's possible, but you have to cut the trace to the on-board antenna. Can anyone confirm or deny this?