I think you'll have to characterise Taiwan's AD as formidable, this is one area they actually take very seriously. All signs indicate they will replace fully all the previous MIM-23 Hawk positions with Sky Bow, so that's a lot.
On the other hand PLA has given a lot of thought into how to take those out too. For example PLA's clone of IAI Harpy was always considered an anti-radiation weapon and the long loitering time is for them to circle over areas where AD may be to either bait them out or keep them suppressed. The way Russians are using Shahed 131, as long range cheap GPS guided cruise missile came as a surprise and considered "wrong".
Taiwan can’t mitigate its fundamental Achilles Heel of distance and space.
It has a lot of AD assets, but not a lot of space to move them around in, and very little time to get moving in the event of AR breaking out.
The bulk of its AD assets are almost certainly going to be destroyed in warehouses and at bases before they even get a chance to think about deploying or dispersing.
The Harpy is really an obsolete weapon and strategy for the PLA these days. They are still effective at their role, but given the kinds of options the PLA has at their disposal, I just don’t think those Harpies will get a chance to do much as the fight would essentially be over by the time they can get on station.
For long term SEAD/DEAD, I think the PLA will use a combination of UAVs, UCAVs and J16s.
WingLoongs and other medium/heavy UCAVs will be essentially take over the SEAD part of the mission from Harpies by providing a 24/7 persistent, recoverable overhead presence with near immediate strike capability as soon as targets are revealed.
I also expect extensive use of micro drones that can drone swarm and navigate complex dynamic environments like forests to be scattered by larger drones or powered dispensers to thoroughly check areas for hidden enemy assets, with overhead UCAVs ready to delivery immediate fires on any targets revealed by the mini drones. Patrolling J16s would be able to bring heavier ordinance to bare almost as quickly should the need arise, and land based MLRS and ballistic missiles are also available for rapid engagement should targets that warrant their deployment be detected.
This is why I always think the Ukraine war is a terrible example for what modern drone warfare will be like. Not because I don’t think drones will revolutionise modern combat, but because I don’t think people can yet fully comprehend just how radical that revolution will be when you have dedicated combat drones deployed on an industrial scale as a comprehensive, multifaceted, mutually supporting ecosystem with multiple redundancies and mutual support baked in, as opposed to the jury-rigged piecemeal approach with converted commercial drones we are seeing in Ukraine. It will be like WWI first gen tanks against modern MBTs.