The initial attack should include electro-magnetic strikes to disable all power and telecommunication facilities military and civilian, and also cut all the undersea fiber-optic cables emanating from Taiwan island.
I highly doubt that.
Almost all military electronics are EM hardened as standard, so the efficacy of an EMP weapon is going to be highly suspect at best.
Also, China will be looking to take over the island afterwards, so it will need to consider the enormous and needless indiscriminate collateral damage EMP weapons would cause on civilian infrastructure and private property. Not only would that exponentially increase the post-reunification reconstruction costs, it also wouldn’t be good at winning hearts and minds to wipe out thousands of dollars of everyone’s private property and potentially cause massive loss of irreplaceable private data as hard drives and memories sticks are wiped and fried.
On top of that, the close proximity of Taiwan to major mainland cities could easily see collateral damage on the mainland from EMP weapons use in Taiwan.
Power stations and military comms can be far more effectively and surgically struck with direct kinetic attacks.
Besides, I can see the PLA wanting individual ROC military units to retain at least comms receiving capabilities, how else are they to know to lay down their arms when ROC surrender
There is just little to no practical value in using emp weapons in Taiwan and massive costs and drawbacks.
EMP weapons are digital age terror weapons that have minimal military application and are instead perfect to cause massive collateral economic damage to civilian infrastructure. You need them for the same reason you need nukes - deterrence. But the actual practice utility of them is very questionable in my view.