Can people access my iphone data by opening it up

My iphone is faceid and pin protected. My apple id is two step authentication on.

It's not working now, so I sent it to a repair man to fix. However, If he opens up the phone, and takes out the storage chip. Can he use that storage on another phone of his ?

Solution 1:

Highly unlikely, unless the repair man:

• Sent your device to Cellbrite
• Has access to a GrayKey box
• Knows your passcode

Given the intertwined relationship between the iPhone's storage, baseband, Secure Enclave etc. (refer to Jash's answer), hypothetically speaking the repair man has a better chance at extracting your data if he left the storage chip in its place.