Is stock room management integrated with S/4HANA TM 2021 version?
as stated by SAP Stock Room Management is integrated with TM already since S/4HANA 2020 FPS01 using the Advanced Shipping and Receiving e.g. to track the load/unloading events with or without HUM.
Stock room management is just a fancy name for good, old LE-WM in S/4HANA. Stock room management is not directly integrated with TM (transportation units, planned shipping handling units or advanced shipping&receiving) as LE-WM is not integrated.
Stock room management is sort of integrated with TM indirectly with outbound deliveries. However you doubt if you can even call it integration.