Not code complaint but if they’re twisted tightly and inserted then there might not be a hazard either problem is you will never know if the connection is reliable. That’s similar to SEU cable where the neutral is made of multiple strands wrapped around the ungrounded conductors. That neutral is terminated by twisting all of the strands together and inserting it into the terminal. And although that is a similar type of connection for the neutral it is permitted, for multiple EGC’s it is not and should be called out for correction.
Same thing for a split bolt often you will see multiple EGC’s in the split bolt and the connection may be adequate to carry the fault current but since that split bolt has not been tested and listed for multiple conductors you cannot reliably predict if it will operate correctly under a fault.