I doubt that team-killing is a bannable offense in CoH2, but feel free to try reporting him and send your replay(.REC) + an explanation via mail to enforcement@relic.com
In teamgames the Sturm officer is very powerful already. Because you buff all the time without spending muni AND you buff your teammates as well. Don't forget that!
So when you use the sturm officer with your inf blobs to attack you have to let him always little bit behind. Which is fine and make able. If enemie inf tries to focus him they have to run through your infs.
Only "problem" is when arty hits your officer. But that doesn't happend so often / then you have to retread your inf anyway.
yeah if they would change the Sturmofficer like that, it would be the wet dream of all panzerfusilier blobbers out there coming true