Ahmed,
The information you mention in the data sheet refer to the EJ capabilities. You need to find in the DS specified the EJ type if is tied or untied.

You also have to see the EJ drawing for more details.
There are EJ with tie rods that allow for compression and are only as safety device (do not allow for expansion due to pressure thrust).

Most likely you have an untied EJ for which you have to check that the maximum movements stay within the values specified by the vendor.
It would be beneficial if you can ask the rotating engineer to have a call with the vendor. He would be able to discuss with you about the EJ features.
Regards