FYI if you set admin cores to be destructable you run the risk of breaking things in the scenario. The last time someone did this they yelled at me about it. :(

You would first want to follow the guide to make a local copy of the scenario as shown here:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1703779262

Then you'd go to CoreNPCAdmin in blocksconfig and change IsDestructible: false to IsDestructible: true

But again, I cannot offer any support when playing with modified configs. So if you encounter any issues even if they don't seem to be related to the changes you made I won't be able to assist you.
Like I said the last person who did this broke something in their save and for some reason blamed me for it so you're on your own here.

Thank you Ravien!

I would never do that, see others do it tho , and feel for ya XD.

Did the backup, set admin core to destruction true, used my mini SV with rail guns to destroy
the core with precision cuts, on previous versions.

On this one i can't destroy the core through the layers of steel and concrete, only in god mode form inside.
The courtyard of the Powerplant floor seems to be indestructible, other POIs are fine.
Hey, you can't have everything, so no worries.

Thanks again, and keep up the good work!

Probably the foundation blocks. You could change the material of the foundation blocks to make them destructable in the block config file.