In the future, there is no need for umpire to ‘give permission’ for the medical team to enter the court if a player fall unconscious.
https://corporate.bwfbadminton.com/news-single/2024/11/15/updates-to-events-regulations
“Medical Emergency Intervention – The Tournament Doctor is now allowed to enter the court without the direction of the referee in cases of suspected cardiac arrest or suspected concussion with blackout.”
This change is reflected in Section 4.1.1 (Instructions to Technical Officials), Section 4.1.1.1 (Instructions to Para Badminton Technical Officials), and in updated versions of Tournament Doctor Guidelines.