Can the erase function on icloud be compromised in anyway?

Basically my iphone 11 was stolen a few days ago, I've gone to icloud to start erasing which took a day to do because my stolen phone was offline leading to a pending. However, It was only till the next day that I received an email from icloud that my iphone has been erased or is in the process to do so. Even though i have gotten the confirmation email, i wanted to ask if it could have been a false erase? Like can the person who stole the iphone just be able to turn off the iphone when the erasure process takes place and cancel it, prompting a premature email saying that it has been erased or do they have a way to fake the process. Ive just been very stressed out and paranoid about my data being being taken and is constantly been on edge for the past week.