i understand that, my question was more like, why they don't replace with new radome when they change to AESA...
They're upgrading an existing aircraft, where things like the air data probe location and relevant telemetry and wiring would already be in place.
If they're upgrading an existing aircraft with a new radar, why do extra work to change something that won't have much effect?
Out of interest, why do you think they would even need to replace the new radome with one that moves or removes the pitot tube on the nosetip -- what utility or role or benefit would such a change bring?
That isn't unique btw, for example, when F-16As are upgraded to F-16Vs which includes an AESA, they retain their nose probe pitot tubes.