Earlier quoted context omitted.
For example swapped LCD will disable truetone and in iPhone 14 reportedly auto brightness. Battery will lock out "battery health". Rear facing camera will glitch out (I think it will not do video and it will reduce framerate dramatically) and front camera will not work correctly at all. All accompanied with constant nagging about non-genuine parts - regardless if you use parts from another iPhone (100% genuine).
It’s just “find my iPhone” extended to individual parts to reduce theft. If you own the other iPhone you will have no problem getting rid of the “unauthorized parts” screen. Reducing iPhone theft is an extremely worthy goal, especially for people who live in high theft countries.
Also it makes zero difference in stealing an iPhone as even iCloud locked iPhone is easily useable for parts.
So no, it is not like that at all.