HomeKit Nanoleaf Essential Bluetooth only

Hi all, I try to connect multiple Nanoleaf essential bulbs and light stripes to HA. I tried different ways but always end up with the same issue. For example, if I connect the lamp/stripe to HomeKit first successfully and check in the Nanoleaf app the device is connected via Thread. If I then remove it it automatically appears in HA to add. However, if I add it then and check the Nanoleaf app again the connection is done via Bluetooth which leads to unacceptable delays. I use multiple HomePod Minis that should act as Thread-Border-Router as well as a Eve Power socket.